surfboard

Abstract

This surfboard is suitable for surfing by sitting on it, holding onto the handles, and maintaining balance while bracing your feet against the board. [Solution] The board comprises a board body 10 that can move forward on water, a seat 20 provided on the rear of the board body 10 on which a user U can sit, a handle 30 provided on the board body 10 in front of the seat 20 on which a user U can grasp, and a footrest 40 provided on the left and right sides of the seat 20 in the left-right direction behind the handle 30 on which a user U sitting on the seat 20 can place the soles of their feet U2 with their knees U1 bent.

Description

Technical Field

[0001] The present invention relates to a surfboard. More specifically, it relates to a surfboard suitable for sitting on the board, grasping the handle, and taking balance while straddling both feet in a sitting state to ride the waves.

Background Art

[0002] Conventionally, technologies such as those disclosed in Patent Documents 1 to 5 are known.

[0003] <Patent Document 1> Japanese Patent Laid-Open No. 48-091797 Patent Document 1 describes a seat portion 2 provided on the rear part of a skateboard 1 and allowing a user (rider) to sit, a handle 3 provided on the skateboard 1 in front of this seat portion 2 and allowing the user to grasp it, a footrest 7 where a user sitting on the seat portion 2 can place their feet in front of the handle 3, and a water skateboard equipped with these is described.

[0004] On the lower right column of page 1 of the same document, lines 5 to ⑨, "Therefore, according to the water skateboard of the present invention, the rider can place their feet on the footrest on the upper part of the skateboard, grasp the side handle in a sitting position, and can perform a brisk water glide on the skateboard. Starting can be done in this form, and in some cases, starting in a lying-down form, and after stabilizing, the rider can extend their feet forward while grasping the handle and glide in a sitting position." is described.

[0005] However, in this water skateboard, since the footrest 7 is provided in front of the handle 3, it is difficult for a user sitting on the seat portion 2 to take the left and right balance of the skateboard while straddling both feet in a sitting state.

[0006] <Patent Document 2> Japanese Patent Laid-Open No. 48-100898 Patent Document 2 describes A seat 2 is provided on the rear of the sliding board 1, where the user (passenger) can sit, A handle 3 is provided on the sliding plate 1 in front of the seat 2, which the user can grasp. A footrest 7 (see Figure 11) on which a user seated on the seat 2 can place their feet, in front of the handle 3, A water slide equipped with [a specific feature] is described.

[0007] On page 2 of the same document, from line 19 in the upper left column to line 6 in the upper right column, "According to the water-sliding board of the present invention described above, the rider sits on a seat provided on the board, grips a handle or grip provided at the front, places their feet on the platform, and can glide smoothly across the water surface in a seated position (or, in some cases, standing position). Furthermore, steering can generally be performed freely, it can be launched from any location, and surfing can be performed more easily and freely than on a surfboard, utilizing the power of waves for self-propulsion without being towed by a motorboat or relying on a vehicle with a propulsion system such as a motorboat." It is stated as follows.

[0008] However, because the footrest 7 of this water slide is positioned in front of the handle 3 (see Figure 4), it is difficult for a user seated on the seat 2 to maintain balance on the slide while bracing both feet in a seated position.

[0009] <Patent Document 3> Full Text of Japanese Utility Model Publication No. 60-195074 Patent document 3 describes a small, lightweight boat having a handle 2.

[0010] However, this small, lightweight boat does not have a seat for the user to sit on.

[0011] <Patent Document 4> Full Text of Japanese Utility Model Publication No. 63-088362 Patent Document 4 contains: "A sports equipment that moves forward using a propulsion device (7) attached to the board body (1) that floats on the water, and requires the user to hold onto the reins (6) to change direction, as well as to use overall body balance and weight shifting." This is stated (see Section 2 of the same document, "Claims for Utility Model Registration"). Furthermore, in the section "(f) Other Examples" on page 4 of the same document, (i) As shown in Figure 4, the boat can be propelled even while holding onto the boat body and floating on the water. (b) A handle can be attached instead of the reins (3). (h) It is also possible to attach seats for passengers to sit on. It is stated as follows.

[0012] However, the document does not describe the positional relationship between the handlebars and the seat.

[0013] <Patent Document 5> Full Text of Japanese Utility Model Publication No. 63-200473 Patent document 5 describes a surfboard having handles 3,3.

[0014] However, this surfboard does not have a seat for the user to sit on, nor does it have a footrest where the user can place their feet with their knees bent while seated. [Prior art documents] [Patent Documents]

[0015] [Patent Document 1] Japanese Patent Application Laid-Open No. 1983-091797 [Patent Document 2] Japanese Unexamined Patent Publication No. 48-100898 [Patent Document 3] Japanese Utility Model Publication No. Showa 60-195074 Full Text Specification [Patent Document 4] Full Text of Utility Model Publication No. 63-088362 [Patent Document 5] Japanese Utility Model Publication No. 63-200473, Full Text Specification [Overview of the project]

Problems to be Solved by the Invention

[0016] The problem to be solved by the present invention is to provide a surfboard that enables a person to sit on the board, hold the handle, and while straddling both feet in a sitting position, balance and surf.

Means for Solving the Problems

[0017] To solve the above problems, the surfboard of the present invention includes a board body that can move forward on water, a seat provided on the rear part of the board body, on which a user can sit, a handle part provided on the board body in front of the seat, which a user can grasp, footrest parts provided on the left and right of the seat in the left-right direction behind the handle part, on which a user sitting on the seat can place the soles of the feet with the knees bent, and is characterized by comprising these.

[0018] With the above configuration, according to this surfboard, the following effects can be obtained. On water, the user can sit on the seat provided on the rear part of the board body, grasp the handle part provided on the board body in front of the seat, and place the soles of the feet on the footrest parts provided on the left and right of the seat in the left-right direction behind the handle part with the knees bent, and in this state, by operating the handle part while straddling the feet, the user can move forward while maintaining the balance of the entire surfboard. Therefore, according to the surfboard of the present invention, a person can sit on the board, hold the handle part, and while straddling both feet in a sitting position, balance and surf.

[0019] In this surfboard, In a plan view, the board body has a front section that extends from the leading edge in the direction of travel toward the rear and to the left and right, reaching the widest part in the left-right direction, and a rear section that extends from this front section toward the rear. The board can be configured to have a seat on the rear where the user can sit.

[0020] This configuration makes it easier to move forward due to the shape of the front of the board, and the presence of a seat on the rear of the board where the user can sit makes it easier to balance the entire surfboard.

[0021] In this surfboard, The handle portion can be configured to be located at the same position as the maximum width portion in the left-right direction, with respect to the front-rear direction. With this configuration, a moment in the lateral direction of the surfboard is more likely to occur at the widest point in the lateral direction, and this moment can be easily contained because the handle is positioned at the same location in the front-to-back direction as the widest point in the lateral direction. As a result, it becomes easier to balance the entire surfboard.

[0022] In this surfboard, In a plan view, the center of buoyancy of the entire surfboard can be positioned to overlap with the seat portion. With this configuration, the center of buoyancy for the entire surfboard is closer to the seat where the user's weight rests, making it easier to balance the entire surfboard.

[0023] In this surfboard, In a plan view, the seat portion is configured as a thickened portion that is thicker upwards at the center of the board body in the left-right direction, and the footrest portions are provided on both sides of this thickened portion in the left-right direction. With this configuration, the thicker portion of the seat makes it easier to position the center of buoyancy in a location that overlaps with the seat, and also makes it easier to support the feet placed on the footrest with the seat.

[0024] In this surfboard, The seat portion may be configured to have a front portion that is convex toward the front, with the footrests provided on the left and right sides of this front portion. With this configuration, the front of the seat is convex towards the front, which increases the degree of freedom of the footrests (i.e., the feet on which they are placed) on the left and right sides of the front.

[0025] In this surfboard, When viewed from the rear, the seat portion can be configured to have an upper part that curves upward in a convex shape. This configuration improves the fit of the user's buttocks to the seat, stabilizing the user's position on the seat and making it easier to balance the entire surfboard.

[0026] In this surfboard, A fin is provided at the lower rear of the board, and this fin is, The fin can be configured as an inverted Y-shape, having a hanging plate that hangs downward from the rear of the board and inclined plates that extend downward to the left and right from the lower part of this hanging plate when viewed from the rear. With this configuration, the effect against the lateral swaying of the surfboard is obtained from the hanging board and the left and right inclined boards, making it easier to balance the surfboard against lateral swaying. [Brief explanation of the drawing]

[0027] [Figure 1] Figures illustrating embodiments of the surfboard according to the present invention, where (a) is a plan view, (b) is a front view of (a) as seen from the rear of the board, (c) is a right side view of (a), (d) is a plan view of (a), (e) is a cross-sectional view of ee of figure (a), and (g) is a cross-sectional view of gg of (a). [Figure 2] A bottom view of the same embodiment. [Figure 3] (a), (b), and (c) are diagrams illustrating usage examples. [Figure 4] (a) and (b) are diagrams illustrating usage examples. [Figure 5] A diagram illustrating the dimensions of each part. [Figure 6] A plan view of a modified example. [Modes for carrying out the invention]

[0028] Hereinafter, embodiments of the surfboard according to the present invention will be described with reference to the drawings. In each figure, the same part or corresponding part is denoted by the same reference numeral.

[0029] The surfboard 1 of the embodiment of the present invention shown in Figure 1 is A board body 10 that can move forward on the water, A seat 20 is provided on the rear of the main board body 10, on which a user U (see Figure 3(b)) can sit, A handle portion 30 is provided on the board body 10 in front of the seat portion 20 (in the direction of arrow F in Figures 1(a) and 1(c)) and can be grasped by the user U. Rearward from this handle portion 30, there are footrest portions 40 (L, R) provided on the left and right sides of the seat portion 20 in the left-right direction (left-right direction in Figure 1(a)), where a user U sitting on the seat portion 20 can place the soles of their feet U2 with their knees U1 (see Figure 3(b)) bent. It is equipped with.

[0030] Given the above configuration, the following effects can be obtained with this surfboard 1.

[0031] For example, as shown in Figure 3(b), on the water (primarily the sea, with the water surface indicated by the symbol S), the user (primarily a surfer) U can sit on the seat 20 located on the rear of the board body 10, grasp the handle 30 located on the board body 10 in front of the seat 20, and place the soles of their feet U2 with their knees U1 bent on the footrests 40 located on the left and right sides of the seat 20 in the left-right direction behind the handle 30. In this position, by bracing their feet (U2) and operating the handle 30, they can move forward while maintaining the balance of the entire surfboard.

[0032] Therefore, with this surfboard 1, one can sit on the board, grasp the handle 30, and maintain balance while sitting with both feet firmly planted on the ground to surf the waves.

[0033] This surfboard 1 can typically be used, for example, as follows:

[0034] As shown in Figure 3(a), when user U is out at sea and reaches a predetermined position where good waves are coming, he places his upper body (abdomen) on the rear of the surfboard 1, puts his lower body in the water, grasps the handles 30 with both hands U4, and gains propulsion by kicking his legs (U2) in the crawl stroke.

[0035] Once sufficient propulsion is gained from the waves, the surfboard 1 can be pulled strongly with the hand gripping the handle 30, and as shown in Figure 3(b), the body can be positioned on the surfboard 1 in the designated location, and the rider can enjoy surfing in the posture described above.

[0036] In this case, as described above, the user U can sit on the seat 20 located on the rear of the board body 10, grasp the handle 30 located on the board body 10 in front of the seat 20, and place the soles of their feet U2 with their knees U1 bent on the footrests 40 located on the left and right sides of the seat 20 behind the handle 30. In this position, by bracing their feet (U2) and operating the handle 30, they can enjoy surfing while maintaining balance on the entire surfboard.

[0037] With existing surfboards, surfers often lose their balance and are thrown into the sea when attempting to take off from a paddling position, or when shifting their weight forward, backward, or sideways on a surfboard that is tossed about by big or small waves. In contrast, the surfboard of the present invention is a surfboard with a completely different concept from existing surfboards, designed to improve these conditions by allowing the user to sit on the board, grasp the handles, and balance while bracing both feet in a seated position to ride the waves.

[0038] If necessary, as shown in Figure 3(c), you can throw your legs out in front of the surfboard 1, lower your body, tilt your body from side to side, or twist your body at the same time to maintain balance while enjoying surfing.

[0039] Furthermore, once you have achieved a stable ride, you can choose the right moment to stand on the surfboard 1 and enjoy surfing from a standing position, as shown in Figure 4(a). Furthermore, if you feel like you're about to lose your balance, you can immediately squat down, grab the handle 30 with your hands, and maintain the stable posture described above to continue riding. An example of using Figure 4(b) will be discussed later.

[0040] As shown in Figure 1(a), in a plan view, the board body 10 has a front board portion 10F that extends from the leading edge portion 11 in the direction of travel toward the rear left and right, reaching the widest portion 12 in the left-right direction (see dashed line), and a rear board portion 10R that extends toward the rear from this front board portion 10F. A seat portion 20 on which a user U can sit is provided on the rear portion 10R of the board.

[0041] With this configuration, the shape of the front part 10F of the board makes it easier to move forward, and the presence of a seat 20 on the rear part 10R of the board where the user U can sit makes it easier to balance the entire surfboard 1.

[0042] The handle portion 30 is located in the same position as the maximum width portion 12 in the left-right direction, with respect to the front-rear direction.

[0043] With this configuration, a moment in the left-right direction of the surfboard (see arrows R1 and R2 in Figure 1(b)) is more likely to occur at the widest part 12 in the left-right direction, and this moment can be easily controlled because the handle portion 30 is located at the same position as the widest part 12 in the front-rear direction. As a result, it becomes easier to balance the entire surfboard. Therefore, "same position" here means that the position is not shifted to such an extent that it becomes difficult to suppress the lateral moment generated in the widest part 12 in the left-right direction. More specifically, it is a position within approximately 10 cm in each of the front-back directions of the widest part 12 in the left-right direction.

[0044] Furthermore, the handle portion 30 is positioned close to the center B of the lift force generated on the surfboard 1. With this configuration, when the maximum moment occurs at the widest point in the left-right direction of the surfboard 1, the surfer can shift their weight onto the handle portion 30, making it easier to efficiently suppress that maximum moment. As a result, it becomes easier to balance the entire surfboard.

[0045] As shown in Figure 1(a), in a plan view, the center of buoyancy B of the surfboard 1 is located in a position that overlaps with the seat portion 20.

[0046] With this configuration, the center of buoyancy B of the entire surfboard is close to the seat 20 on which the user U's weight rests, making it easier to balance the entire surfboard.

[0047] More specifically, the surfboard's center of buoyancy (center of the surfboard's volume) B is designed to overlap with the position of the seat 20 where the surfer's weight rests. This configuration distributes the surfer's weight evenly across the entire surfboard, making it easier to maintain balance.

[0048] Furthermore, to ensure that the center of buoyancy of the entire surfboard (the center of the surfboard's volume) B is located in front of the seat portion 20 where the surfer's weight rests, the volume of the seat portion 20 can be adjusted by controlling the thickness of the seat portion 20 and the thickened portion 24. This makes it easier to balance the entire surfboard.

[0049] In this surfboard 1, the speed during normal use is assumed to be very slow compared to conventionally known surfboards, approximately 1 m / s to 3 m / s (approximately 4 km / h to 12 km / h). Therefore, the lift force received from the water (seawater) is also smaller than that of conventionally known surfboards, and as shown in Figure 1(a), the center of the lift force D is slightly behind the handle position of surfboard 1 in a plan view. Having the center of the lift force D close to the handle position of surfboard 1 in a plan view makes it easier to operate the surfboard. Therefore, in this embodiment, the center position (estimated position) D of the lift is marked (for example, with a black circle) to provide reference to the user.

[0050] The seat portion 20 is configured as a thickened portion (20) that is thicker upwards (arrow UP direction in Figures 1(b) and (c)) at the center of the board body 10 in the left-right direction when viewed from above, and the footrest portions 40 (L, R) are provided on the left and right sides of this thickened portion (20) in the left-right direction.

[0051] With this configuration, since the seat portion 20 is thick, it becomes easier to position the center of buoyancy B in a position that overlaps with the seat portion 20, and it also becomes easier to support the feet placed on the footrests 40 (L,R) with the seat portion 20 (see Figure 3(b)). Furthermore, it is also possible to, for example, sandwich the seat portion 20 from both sides with both feet.

[0052] The seat portion 20 has a front portion 21 that is convex toward the front, and the footrest portions 40 (L, R) are provided on the left and right sides of this front portion 21.

[0053] With this configuration, the front portion 21 of the seat portion 20 is convex toward the front, which increases the degree of freedom of the footrests 40 (i.e., the feet on which they are placed) that are provided on the left and right sides of the front portion 21.

[0054] As shown in Figure 1(b), in a rear view, the seat portion 20 has an upper part 22 that curves upward in a convex shape.

[0055] This configuration improves the fit of the user U's buttocks to the seat 20, stabilizing the position of the user U's buttocks relative to the seat 20, making it easier to balance the entire surfboard.

[0056] A fin 50 is provided at the bottom of the 10R rear section of the board, and this fin 50 is, In a rear view (Figure 1(b)), the fin has a reverse Y-shape in a rear view, with a hanging plate 51 that hangs downward from the rear 10R of the board, and inclined plates 52, 52 that extend downward to the left and right from the lower part of the hanging plate 51.

[0057] With this configuration, the resistance to the lateral swaying of the surfboard 1 (in the directions of arrows R1 and R2 in Figure 1(b)) is effectively obtained by the hanging plate 51 and the left and right inclined plates 52, 52, making it easier to balance the surfboard 1 against lateral swaying. In other words, when the surfboard rocks from side to side, the inclined plates 52, 52 extending downwards and to the left and right of the inverted Y-shaped fin 50 push back the seawater, and the reaction force creates a counter-rotation moment, making it easier to balance the surfboard against side-to-side rocking (in the directions of arrows R1, R2). Furthermore, the strength of the fin 50 itself is also improved.

[0058] In Figure 1, 60 is a towing eyebolt located at the tip of the board. A rope can be attached to this eyebolt 60 to tow the surfboard 1, or, as shown in Figure 4(b), a child UC can be placed on the surfboard 1 and an adult UA can pull the rope 61 to play together.

[0059] Further details are provided below.

[0060] The board body 10 can be made of any known suitable material, such as lightweight synthetic resins like polyurethane foam or polystyrene foam. It is desirable to apply a waterproofing and strength-enhancing treatment to the surface using a known synthetic resin layer (coating layer). As shown in Figure 1, the central part 13 of the board body 10 is flat, and the area around this flat surface 13 is inclined 14.

[0061] The thick seat portion 20 can be integrally constructed from the same material as the board body 10, or it can be a separate component joined to the board body 10 using appropriate joining means (for example, adhesive, welding, bolts and nuts, screws, etc.).

[0062] On the lower side of the board body 10 of the seat portion 20, a thick portion 24 is provided that is approximately the same shape as the seat portion 20 when viewed from above. This thickened section 24 also serves as a fluid regulating element. This thickened portion 24 can be integrally constructed from the same material as the board body 10, or it can be a separate component joined to the board body 10 using appropriate joining means (for example, adhesive, welding, bolts and nuts, screws, etc.).

[0063] Positioning the handle 30 at the center of the surfboard's maximum width W2 is an effective position to prevent the surfboard from tilting when weight is applied to the handle. The handle can be any shape that allows the user U to grasp it, but since weight is constantly applied from the left, right, front, back, and up and down, it must be designed to have sufficient strength. The illustrated handle portion 30 has three vertical bar portions 31 installed on the board body 10, a horizontal bar portion 32 connecting the upper parts of the vertical bar portions 31, and a reinforcing bar portion 33 provided at the front in the center in the left-right direction. The handle portion 30 can be integrally constructed from a rod-shaped body (including a pipe), or it can be integrally constructed with the surfboard body 10. The handle portion 30, which is separate from the board body 10, can also be joined to the board body 10 by appropriate joining means (for example, adhesive, welding, bolts and nuts, screws, etc.).

[0064] The fin 50 can be constructed by integrally forming the hanging plate 51 and the inclined plates 52, 52 from a known and suitable material, such as synthetic resin, and can be joined to the board body 10 by a known and suitable joining means (e.g., adhesive, welding, bolts and nuts, screws, etc.).

[0065] The eyebolt 60 can be fitted with known eyebolts in known ways.

[0066] The overall shape of the surfboard 1 in this embodiment is shorter front to back and wider left to right compared to conventional surfboards, thereby increasing stability against lateral swaying. Specifically, the dimensions of each part of the surfboard 1 in this embodiment are as follows, for example. Please refer to Figure 5 for further explanation. (See Figure 1 for the symbols used for each part.)

[0067] • Width of each side W1 = 50-70cm (Total width W2 = 100-140cm) If the width W1 is less than 50cm, it is too narrow and will not provide sufficient balance against side-to-side swaying. Conversely, if it is more than 70cm, it is too wide, which may make it difficult to control the surfboard's direction of travel depending on the type of wave, and it will also be difficult to handle. Therefore, it is desirable to keep the dimensions within the above range. In the diagram, W1 = 60 cm and W2 = 120 cm.

[0068] ·Total length L3=100~120cm If the total length L3 is less than 100cm, it will be cramped to hold onto the handles and sit down, and if it exceeds 120cm, the surfboard will lose its compactness and become difficult to handle, so it is desirable to use the dimensions mentioned above. In the diagram, L3 is set to 100 cm. The buoyancy of a surfboard is approximately 90 kgf at L3 = 100 cm and approximately 110 kgf at L3 = 120 cm.

[0069] • Front 10F length L1 = 35~45cm If the length L1 of the front 10F is less than 35cm, the front tip angle θ1 becomes too wide, leading to a decrease in speed. If L1 exceeds 45cm, it becomes difficult to set the center of lift of the surfboard (the center of the bottom area of ​​the surfboard) close to the handle position. Therefore, it is desirable to use the dimensions described above. In the illustration, L1 = 40 cm.

[0070] • Rear 10R length L2 = 55~85cm If the length L2 of the rear 10R is less than 55cm, the distance between the seat 20 and the handle 30 will be too small, making it too cramped for the user U to sit and grasp the handle. If it exceeds 85cm, the surfboard will be too large, losing its compactness and becoming difficult to handle, so the above dimensions are desirable. For adult users, L2 = 80cm is the standard, while for smaller, more compact surfboards, L2 = 60cm. In the illustration, L2 = 60 cm. When the length L2 of the rear 10R is 60 cm, the approximate buoyancy is 90 kg, and when L2 is 80 cm, the approximate buoyancy is 110 kgf.

[0071] The dimensions of other parts of the illustrated object are as follows (see Figure 1 for the symbols of each part). • Board body thickness T1 = 10cm (If T1=8cm, then L2=60cm, and the approximate buoyancy will be around 70kgf.) • Edge thickness T2 = 3cm • Length L4 of the inclined surface 14 of the board body 10 = 20 cm • Thickness T4 = 5cm of the thickened portion 24 facing the seat portion 20 on the underside of the board body 10. (It is also possible to adjust the thickness of T4 within the range of T4 = 5 to 10 cm so that the center of buoyancy B of the surfboard is centered at the position of both feet.) • Length of seat 20 L5 = 47cm • Rear length L6 = 30cm • Seat thickness (height) T3 = 10cm (It is also possible to adjust the thickness of the seat so that the center of buoyancy B is in the center of both feet.) • Handle section 30: front-to-back length L8 = 10 cm • Handle section height H1 = 10cm • The length of the handle section 30 in the left-right direction is W4 = 40 cm. • Fin 50: Front-to-back length L9 = 20cm (If the surfboard tends to wobble from side to side, L9 can be set within the range of 20-40cm.) • Fin 50 height H2 = 15cm • Fin 50, left-right length W5 = 20cm • The height of the hanging plate 51 of fin 50 is H3 = 5cm (H3=10cm is also possible if necessary) • The inclination angle (included angle) of the inclined plate 52,52 of fin 50 is θ2 = 120 degrees. (θ2 can also be 90 to 120 degrees) • Distance L7 from the tip of the board of the eyebolt 60 = 7cm (L7 can be 7-15cm)

[0072] With the above configuration, the buoyancy of surfboard 1 will be approximately 90-110 kg.

[0073] Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and can be appropriately modified and implemented within the scope of the gist of the present invention. For example,

[0074] As shown in Figure 6, a nose body (a wave-cutting body with a tapered triangular shape in plan view) 70 may be provided at the front of the board body 10 to increase the speed. The nose body 70 may be integrated with the board body 10 from the beginning, or it may be made detachable as an option. [Explanation of Symbols]

[0075] 1: Surfboard 10: Board body 20: Seat part 30: Handle section 40: Footrest

Claims

1. A board body (10) that can move forward on the water, A seat (20) is provided on the rear of the main board body (10) on which a user (U) can sit, A handle portion (30) is provided on the board body (10) in front of the seat portion (20) and can be grasped by the user (U), Rearward from the handle portion (30), there are footrest portions (40) provided on the left and right sides of the seat portion (20) in the left-right direction, on which a user (U) sitting on the seat portion (20) can place the soles of their feet (U2) with their knees (U1) bent. A surfboard characterized by having the following features.

2. In claim 1, In a plan view, the board body (10) has a front board portion (10F) that extends from the leading edge (11) in the direction of travel toward the rear left and right and reaches the widest part in the left-right direction (12), and a rear board portion (10R) that extends toward the rear from this front board portion (10F). A surfboard characterized in that a seat (20) on the rear portion (10R) of the board is provided on which the user (U) can sit.

3. In claim 2, The surfboard is characterized in that the handle portion (30) is provided at the same position as the maximum width portion (12) in the left-right direction, with respect to the front-rear direction.

4. In claim 1 or 2, A surfboard characterized in that, in a plan view, the center of buoyancy (B) of the entire surfboard is located in a position that overlaps with the seat portion (20).

5. In claim 1 or 2, In a plan view, the seat portion (20) is configured as a thickened portion that is thicker upwards at the center of the board body (10) in the left-right direction, and the footrest portions (40) are provided on both sides of this thickened portion in the left-right direction, characterized in that the surfboard is configured in a plan view.

6. In claim 5, The surfboard is characterized in that the seat portion (20) has a front portion (21) that is convex toward the front, and the footrest portions (40) are provided on the left and right sides of this front portion (21).

7. In claim 5, A surfboard characterized in that, when viewed from the rear, the seat portion (20) has an upper part (22) that curves upward in a convex shape.

8. In claim 1 or 2, A fin (50) is provided at the lower part of the rear portion (10R) of the board, and this fin (50) is A surfboard characterized by having an inverted Y-shaped fin, which, when viewed from the rear, has a hanging plate (51) that hangs downward from the rear of the board (10R) and inclined plates (52) that extend diagonally downward to the left and right from the lower part of the hanging plate (51).

9. In any one of claims 1 to 3, A surfboard characterized in that the center of lift (D) is located near the handle position in a plan view.

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