Vehicle cargo compartment structure and mounting jig
The vehicle cargo compartment structure addresses assembly complexity and space inefficiency by using a tether anchor-based mounting jig for easy installation and reconfiguration of storage solutions, optimizing space usage and avoiding seat back damage.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- YASUNAGA CO LTD
- Filing Date
- 2024-12-16
- Publication Date
- 2026-06-26
AI Technical Summary
Existing vehicle luggage compartment structures require numerous parts, are time-consuming to assemble, and lack flexibility in expanding or contracting to accommodate varying luggage sizes, while also occupying space when not in use, and may damage the seat back during installation.
A vehicle cargo compartment structure utilizing a mounting jig fixed to a tether anchor on the seat back, allowing for easy installation of storage boxes, shelves, and outdoor equipment, with components that can be slidably extended or retracted to optimize space usage.
The structure effectively utilizes rear compartment space for storage and loading, enabling easy installation and reconfiguration of storage solutions without damaging the seat back, and allowing for flexible use of space based on need.
Smart Images

Figure 2026105666000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a luggage compartment structure for a vehicle and a mounting jig. More specifically, it relates to a luggage compartment structure for a vehicle and a mounting jig that can effectively utilize the luggage compartment space at the rear of the vehicle compartment to store and load luggage, or install outdoor supplies in the luggage compartment with a simple operation.
Background Art
[0002] With the recent increase in the outdoor boom, particularly small SUVs (Sport Utility Vehicles) and light commercial vehicles (hereinafter collectively referred to as "small vehicles") have become increasingly popular as outdoor vehicles for camping and the like.
[0003] Small vehicles have limited loading space in the luggage compartment provided at the rear of the vehicle, so it is necessary to load luggage efficiently. As a luggage compartment structure of such a vehicle, for example, the technology disclosed in Patent Document 1 is known. Specifically, a shelf plate member suspended on the ceiling side of the luggage compartment of the vehicle is composed of left and right side frames and a shelf frame. By attaching the left and right side frames to the upper side of the left and right side bodies of the luggage compartment and hanging them vertically, and hooking the shelf frame to the lower frame of the left and right side frames, it is disclosed that a shelf plate on which luggage can be placed can be assembled and formed.
[0004] In addition, Patent Document 2 discloses a luggage compartment structure for a vehicle in which the backrest of the rear seat of the vehicle (hereinafter referred to as the "seat back") is folded onto the seat cushion to open the space between the luggage compartment and the vehicle interior. Specifically, a first support plate is fixed to the back surface of the seat back of the vehicle, and a storage box movable by a slide mechanism is arranged on a second support plate connected to the first support plate via a hinge member, thereby disclosing a configuration in which the storage box can be easily taken in and out from the outside of the vehicle compartment to the inside of the vehicle compartment.
Prior Art Documents
Patent Documents
[0005] [Patent Document 1] Japanese Patent Application Publication No. 10-179273 [Patent Document 2] Japanese Utility Model Publication No. 61-70142 [Overview of the Initiative] [Problems that the invention aims to solve]
[0006] However, the configuration disclosed in Patent Document 1 requires a large number of parts, which makes assembly time-consuming. Furthermore, the size and shape of the side frames and shelf frames of the shelf members are fixed, making it impossible to flexibly expand or contract the shelf members according to the size of the luggage to be stored in the cargo compartment. In addition, when not in use, the shelf members may take up valuable space in the cargo compartment.
[0007] Furthermore, in the configuration disclosed in Patent Document 2, the first support plate is fixed to the back of the seat back by screws or the like, which not only makes the installation of the first support plate complicated, but also carries the risk of damaging the back of the seat back or the cargo area floor during processing.
[0008] In response to the above-mentioned problems, the inventors of this invention conducted diligent research and, focusing on existing tether anchors used to secure child seats, which are installed on the back of the vehicle's seatbacks, have completed a vehicle cargo compartment structure that allows a mounting jig to be fixed to the tether anchor when the child seat is not in use, and then allows storage boxes, shelves, tables, and other outdoor equipment to be secured to the mounting jig for storing and loading luggage.
[0009] The present invention was conceived in view of the above points, and aims to provide a vehicle cargo compartment structure and mounting jig that makes effective use of the cargo compartment space at the rear of the vehicle and allows storage boxes, storage shelves, or outdoor equipment to be easily installed in the cargo compartment. [Means for solving the problem]
[0010] To achieve the above objective, the vehicle cargo compartment structure of the present invention is a vehicle cargo compartment structure in which a cargo compartment having a floorboard is formed between a rear seat and a rear cargo compartment opening, the rear seat having a seat back that is rotatable between a seated state in which the occupant can sit and a tilted state in which the seat back is tilted forward onto the upper part of the seat cushion, and the rear seat having an anchor member made of a rod-shaped body installed on the back of the tilted seat back, a base plate installed on the back of the seat back for fixing an object to be mounted in the cargo compartment, and a mounting jig fixed to the anchor member and having a base on which the base plate is mounted.
[0011] With the above configuration, installing the base plate for securing the mounting unit to the back of the seat back is a simple process: first, attach the mounting jig to the anchor member, and then attach the base plate to the base of the mounting jig. This completes the installation of the base plate for securing the mounting unit to the back of the seat back. At this time, no special processing of the back of the seat back is required, so there is no risk of damaging the seat back.
[0012] Furthermore, if the anchor component is an existing tether anchor to which the child seat securing tether belt is attached, the tether anchor used in many vehicles can be reused as the anchor component. This makes effective use of the tether anchor that would otherwise not be able to perform its intended function when the child seat is not in use, and eliminates the need to install the anchor component on the back of the seat back.
[0013] Furthermore, when the mounting jig is fixed to the tether anchor by joining the first flange portion located on the seat back side with the tether anchor in between, and the second flange portion located on the opposite side of the seat back, the mounting jig can be firmly fixed to the tether anchor by the first and second flange portions.
[0014] Furthermore, when the seatback is folded forward, a pair of rail receiving parts are formed along the length direction on both sides in the width direction of the base plate, extending from the base end on the interior side to the tip on the rear cargo compartment opening side, and are slidable between a stored state where they are housed within the rail receiving parts and an extended state where the tip is pulled out to near the cargo compartment opening, and the mounting body is a table that is board-shaped and has a pair of slide bars that can be fitted into the rail groove along the length direction of the back surface, and the slide bars slide along the rail groove so that the table can be pulled out between a stored state where it is housed in the cargo compartment and an extended state where it is pulled out to the outside of the cargo compartment from the rear cargo compartment opening, the table as the mounting body is slidably mounted on a base plate installed on the back of the seatback via a mounting jig, so that it can be stored in the cargo compartment when the vehicle is moving, and when used outdoors such as camping, the table can be pulled out from the cargo compartment and used as a workbench for any purpose.
[0015] Furthermore, when the table is stored inside the cargo area, it has a predetermined length from the base end on the interior side to the tip end on the rear cargo area opening side. A slide bar is installed in a predetermined range from the base end to the tip end on the underside of the table. If the tip end of the underside of the table has legs to support the table on the mounting surface when the table is pulled out outside the cargo area, the table's legs can be extended and supported on the mounting surface when the table is in use, thereby ensuring stability when the table is in use. When the table is not in use, for example, if the legs are foldable, they can be folded and stored inside the cargo area, or if the legs are detachable, the legs can be removed from the table and stored inside the cargo area, so that the storage space inside the cargo area is not taken up.
[0016] Furthermore, when the seat back is folded forward, a pair of frame members extend from both ends of the base plate in the width direction along the length direction of the seat back, and the mounting body has a frame main body consisting of left and right side panels and a top panel, with at least the front opening, and the frame main body is fixed to the frame members, so that by fixing the roughly gate-shaped frame main body to the base plate as the mounting body, it becomes possible to store luggage inside the frame main body or load luggage on the top panel.
[0017] Furthermore, if the frame body has a drawer that can be freely pulled out through an opening on the front, items can be stored in the drawer, and then the necessary items can be easily retrieved by pulling out the drawer.
[0018] To achieve the above objective, the mounting jig of the present invention is applied to a vehicle cargo compartment structure in which a cargo compartment with a floorboard is formed between a rear seat and a rear cargo compartment opening, the rear seat having a seat back that is rotatably supported between a seated state in which the occupant can sit and a tilted state in which the seat back is tilted forward onto the upper part of the seat cushion, and a tether anchor consisting of an existing rod-shaped body that is installed on the back of the tilted seat back and to which a tether belt for securing a child seat is to be attached, and a second flange portion located on the other side having a base plate on which a base plate for securing a load to be mounted in the cargo compartment is installed, and the jig is fixed to the tether anchor by combining these two flange portions in an opposing state.
[0019] With the above configuration, the mounting jig can be firmly fixed to the tether anchor installed on the back of the seat back. Furthermore, since a base plate for fixing the mounted object can be installed on the mounting jig, the base plate can be installed on the back of the seat back with simple work without modifying the back of the seat back. [Effects of the Invention]
[0020] The luggage compartment structure and mounting jig for a vehicle according to the present invention can effectively utilize the luggage compartment space at the rear of the passenger compartment to store and load luggage in a storage box, storage shelf, or install outdoor supplies in the luggage compartment with simple operations.
Brief Description of the Drawings
[0021] [Figure 1] It is a rear perspective view and an enlarged view of a main part of the luggage compartment structure and mounting jig for a vehicle according to the first embodiment of the present invention. [Figure 2] In the luggage compartment structure for a vehicle according to the first embodiment of the present invention, it is a view showing a state where a table as a mounting body is pulled out. [Figure 3] In the luggage compartment structure for a vehicle according to the first embodiment of the present invention, it is a view showing a state where a cabinet is installed above the table in a stored state. [Figure 4] In the luggage compartment structure for a vehicle according to the second embodiment of the present invention, it is a view showing a state where a cabinet as a mounting body is installed. [Figure 5] It is a view showing a usage state to which a mounting body according to an embodiment of the present invention is applied.
Modes for Carrying Out the Invention
[0022] Hereinafter, the luggage compartment structure and mounting jig for a vehicle according to the embodiments of the present invention will be described with reference to the drawings for the purpose of providing an understanding of the present invention.
[0023] [First Embodiment] First, a vehicle cargo compartment structure according to the first embodiment of the present invention will be described with reference to Figures 1 to 3. Figure 1 is a perspective view of a vehicle 1 having a rear door (not shown) as seen from diagonally above and behind, where a cargo compartment S is formed behind the rear seat 2. As shown in Figure 1, the rear seat 2 is a so-called bench seat type split-folding seat, and has a seat cushion 21 which is the seat surface on which the occupant sits, and a seat back 22 which supports the back and waist of the occupant sitting on the seat cushion 21. The seat back 22 is configured to be rotatable between a seated state in which the occupant can sit and a folded-down state in which it is folded forward onto the top of the seat cushion 21.
[0024] The cargo area S is equipped with a floorboard 3, and when the seatback 22 is folded forward, the floorboard 3 and the back of the seatback 22 become a continuous, fully flat surface, making it possible to load luggage and the load-bearing equipment 8 described later into the cargo area S. In the following explanation, the seatback 22 is assumed to be folded forward, and the space including the folded seatback 22 and the floorboard 3 is defined as the cargo area S.
[0025] An anchor member 4 for securing the mounting jig 5 (described later) is installed on the back of the seat back 22. The anchor member 4 is a round bar and is installed within an anchor housing (not shown). In this embodiment of the present invention, the anchor member 4 can be, for example, an existing tether anchor used to secure a tether belt when fixing a child seat to the rear seat 2.
[0026] Here, the anchor member 4 does not necessarily have to be a tether anchor for securing the tether belt for child seat fastening; the anchor member 4 shown in Figure 1 may be newly installed on the back of the seat back 22. However, by using an existing tether anchor, which is used in many vehicles, as the anchor member 4, the tether anchor, which would otherwise not be able to perform its original function when the child seat is not in use, can be effectively utilized, and the work of installing the anchor member 4 on the back of the seat back 22 becomes unnecessary.
[0027] The mounting jig 5 is a jig for fixing the base plate 6, which will be described later. The mounting jig 5 consists of a roughly flat first flange portion 51 and a second flange portion 52. A semi-cylindrical groove, which conforms to the outer circumference shape of the anchor member 4, is formed along the width direction in the approximate center of the first flange portion 51. The anchor member 4 is then fitted into the groove of the first flange portion 51, which is located on the back side of the seat back 22, with the anchor member 4 in between. Furthermore, the second flange portion 52 is positioned opposite the first flange portion 51 and the anchor member 4 is sandwiched between them to complete the assembly.
[0028] With the first flange portion 51 and the second flange portion 52 joined together, the mounting jig 5 can be firmly fixed to the anchor member 4 by screwing the four corners together. A base 53 is provided on the second flange portion 52, and the base plate 6, which will be described later, is installed on the base 53.
[0029] The base plate 6 is a base for fixing the load-bearing body 8 to be mounted in the cargo compartment S. It has a main body portion 61 that is roughly rectangular in plan view, and rail receiving portions 62 that are formed in a roughly U-shape with an upward opening at both ends in the width direction of the main body portion 61 and extend along the length direction. Since the length and width of the base plate 6 are roughly the same as the height and width of the seat back 22, the seat back 22 can be rotated between the seated position and the forward-folded position while the base plate 6 is installed on the seat back 22.
[0030] Therefore, even when the seat back 22 is in the seated position, there is no need to remove the base plate 6 from the seat back 22. The base plate 6 can always be attached to the seat back 22, and when in use, the load 8 can be secured to the base plate 6 simply by tilting the seat back 22 forward. In addition, even when the seat back 22 is in the seated position, hooks for securing luggage may be attached to the base plate 6.
[0031] A pair of slit grooves 63 are formed parallel to the rail receiving portion 62 approximately in the center of the main body portion 61 of the base plate 6. These slit grooves 63 are formed to substantially correspond to the base 53 of the second flange portion 52 of the mounting jig 5 described above. With the base plate 6 installed on the base 53, the mounting holes (not indicated by reference numerals) formed in the slit grooves 63 and the base 53 are aligned, and the base plate 6 can be fixed with known fastening means such as bolts and nuts.
[0032] Here, it is not necessarily required that the base plate 6 has a slit groove 63. For example, a mounting hole may be formed in the base 53 of the second flange portion 52 at a position approximately corresponding to the mounting hole formed in the base 53. However, since forming a slit groove 63 allows the mounting position of the base plate 6 to be adjusted to any position, it is preferable to form a slit groove 63 in order to increase the degree of freedom in the mounting position of the base plate 6 to the mounting jig 5.
[0033] As shown in Figures 2 and 3, a frame material 7 of substantially the same type as the rail receiving portion 62 of the base plate 6 is fitted into the rail receiving portion 62, and a rail groove 71 is formed on the upper surface of the frame material 7 along the length from the base end to the tip. The frame material 7 is configured to slide freely between an extended state (Figure 2) in which the tip is pulled out toward the outside of the cargo compartment (outside the vehicle compartment) and a stored state (Figure 3) in which the entire frame material is stored within the rail receiving portion 62.
[0034] A stopper bolt 64 is inserted at a predetermined position on the side wall at the tip of the rail support portion 62. By tightening the stopper bolt 64, the tip of the stopper bolt 64 contacts the side wall of the frame material 7 inside the rail support portion 62, thereby fixing the frame material 7 in the predetermined position. Therefore, the position of the frame material 7 relative to the rail support portion 62 can be changed by loosening the stopper bolt 64 when the frame material 7 is to be slidable within the rail support portion 62, and by tightening the stopper bolt 64 when the frame material 7 is to be fixed in the predetermined position.
[0035] It should be noted that the stopper used to secure the frame material 7 does not necessarily have to be the stopper bolt 64 described above. As long as it can restrict the relative movement of the frame material 7 with respect to the base plate 6, the structure of the stopper is not particularly limited. For example, a configuration could be adopted in which the stopper functions automatically when the frame is pushed in to the stored position or when it is pulled out to the extended position.
[0036] In the first embodiment of the present invention, the mounting unit 8 is a table 81a that can be used outside the vehicle. The table is rectangular in shape, slightly shorter than the overall length of the cargo compartment S and slightly shorter than the overall width of the seat back 22. On its underside, a slide bar 82, which can be fitted into the rail groove 71 of the frame material 7, is installed along the length from the base to the tip. In addition, a gate-shaped cabinet 84a is installed above the table 81a as needed, as shown in Figure 3.
[0037] When installing the table 81a, which is the mounted body 8, onto the base plate 6, the installation is completed by inserting the slide bar 82 into the rail groove 71 of the frame material 7. The rail groove 71 is provided with a stopper (not shown) to restrict the relative movement of the slide bar 82 with respect to the rail groove 71, so that the relative movement of the table 81a with respect to the frame material 7 is restricted in both the stored state and the extended state of the table 81a.
[0038] When storing the table 81a in the cargo compartment S, pushing the table 81a toward the interior of the vehicle causes the slide bar 82 of the table 81a to slide toward the interior of the vehicle within the rail groove 71 of the frame material 7, and the frame material 7 also slides toward the interior of the vehicle within the rail support portion 62, thereby storing the table 81a in the cargo compartment S.
[0039] On the other hand, when the rear door is open and the table 81a is pulled out toward the outside of the cargo area, the slide bar 82 of the table 81a slides toward the outside of the cargo area within the rail groove 71 of the frame material 7, and the frame material 7 also slides toward the outside of the cargo area within the rail receiving portion 62, so that the table 81a in the cargo area S is pulled out toward the outside of the cargo area from the rear cargo opening.
[0040] Furthermore, the table 81a does not necessarily need to slide all the way outside the cargo area; the range of motion of the table 81a can be set arbitrarily.
[0041] [Second Embodiment] Next, a vehicle cargo compartment structure according to a second embodiment of the present invention will be described. In the following description, components common to the first embodiment will be denoted by the same reference numerals, and redundant descriptions will be omitted.
[0042] In the vehicle cargo compartment structure according to the second embodiment, similar to the first embodiment, a mounting jig 5 is fixed to a tether anchor which serves as an anchor member 4, and a base plate 6 for fixing a mounted body 8 is installed on the mounting jig 5.
[0043] The base plate 6 has rail receiving portions 62 on both sides in the width direction of the main body portion 61 in which slit grooves 63 are formed. The frame material 7 is fitted into the rail receiving portions 62 and fixed in place by stopper bolts 64 so that it cannot slide. In addition, a rail groove 71 is formed on the upper surface of the frame material 7 from the base end to the tip.
[0044] The mounting body 8 is then fixed to the base plate 6 as described above. In this embodiment, the mounting body 8 is a rectangular parallelepiped cabinet 84b having a frame body 85 with an open front and left and right side plates and a top plate, and a drawer 87 that is provided to be retractable through the opening in the front of the frame body 85 and has a storage space formed inside.
[0045] Slide bars 86 extend from the base end to the tip along the length of the bottom surface of both side panels of the cabinet 84b. The slide bars 86 are fitted into rail grooves 71 formed on the upper surface of the frame material 7 and are fixed in a non-sliding manner by caps 88 fitted to the tips of the frame material 7.
[0046] Here, the cabinet 84b does not necessarily have to have a drawer section 87; it may consist only of the frame body section 85, and items may be stored in the space enclosed by the top plate and side walls of the frame body section 85.
[0047] Furthermore, the cabinet 84b does not necessarily have to be fixed immovably to the base plate 6. Similar to the first embodiment, the frame material 7 may be movable relative to the rail receiving portion 62, and the slide bar 82 of the cabinet 84b may be configured to be movable relative to the rail groove 71, thereby configuring the cabinet 84b to allow the cargo compartment S to slide.
[0048] Figure 5 shows an example of applying the table 81a and cabinet 84 according to the first embodiment and the cabinet 84b according to the second embodiment to a vehicle 1, as described above. As shown in Figure 5, for example, by installing the table 81a and cabinet 84a, which are the mounting units 8 according to the first embodiment, on the left seat back 22 in the direction of travel of the vehicle, and installing the cabinet 84b, which is the mounting unit 8 according to the second embodiment, on the right seat back 22, the table 81a, cabinet 84a, and cabinet 84b can be installed simultaneously on a single vehicle 1.
[0049] The table 81a can be pulled out of the cargo area and used as a workbench for various purposes. For example, the table 81a can be used as a dining kitchen for cooking and eating outdoors. Additionally, since the underside of the table 81a is equipped with detachable or foldable legs 83, the stability of the workbench can be increased by placing the legs 83 on the surface when the table is pulled out. Furthermore, by installing a legless table 81b inside the cargo area S, the workspace can be further expanded.
[0050] Furthermore, cabinet 84b allows for the storage of small items needed for outdoor activities within the storage space of drawer 87. In addition, by loading lightweight, large items such as sleeping bags on top of cabinets 84a and 84b, the storage space of the cargo compartment S can be used more effectively.
[0051] It should be noted that the mounting body 8 shown in the above embodiments is just one example, and it is possible to install mounting bodies 8 other than the table 81a, cabinet 84a, and cabinet 84b, or to install any one of the table 81a, cabinet 84a, and cabinet 84b, and furthermore, their arrangement can be freely laid out.
[0052] Furthermore, the structure of the base plate 6 according to the embodiment described above is just one example, and can be appropriately modified depending on the shape and type of the mounting body 8 to be installed in the cargo compartment S. In that case, since the mounting jig 5 for fixing the base plate 6 is common, multiple types of base plates 6 may be prepared and the base plate 6 may be changed according to the mounting body 8 to be installed in the cargo compartment S.
[0053] As described above, the vehicle cargo compartment structure and mounting jig according to the present invention make effective use of the cargo compartment space at the rear of the vehicle and allow storage boxes, storage shelves, or outdoor equipment to be easily installed in the cargo compartment. [Explanation of Symbols]
[0054] 1 vehicle 2 Rear seats 21 Seat Cushion 22 Seatback 3 Floorboards 4 Anchor members 5. Mounting jig 51 First flange section 52 Second flange section 53 Pedestal 6 Base plate 61 Main body 62 Rail support section 63 Slit groove 64 Stopper bolts 7 Frame materials 71 Rail groove 8. Mounted Unit Tables 81a and 81b 82 Slide Bar 83 Legs 84a, 84b cabinet 85 Frame main body 86 Slide Bar 87 Drawer section 88 Cap S Cargo area
Claims
1. A vehicle cargo compartment structure comprising a rear seat having a seat back that can rotate between a seated position that supports the back of an occupant seated on a seat cushion and a tilted position where the seat cushion is tilted forward, and a cargo compartment having a floorboard between the rear cargo compartment opening, An anchor member consisting of a rod-shaped body installed on the back of the tilted seat back, A base plate is installed on the back of the seat back and secures the mounting unit to be placed inside the cargo compartment, The mounting jig includes a base on which the base plate is mounted and which is fixed to the anchor member. Vehicle cargo compartment structure.
2. The aforementioned anchor member is an existing tether anchor to which a tether belt for securing a child seat is attached. The mounting jig is fixed to the tether anchor by joining together a first flange portion located on the seat back side and a second flange portion located on the opposite side of the seat back side, with the flange portion facing each other. The vehicle cargo compartment structure according to claim 1.
3. When the aforementioned seatback is folded forward, A pair of rail receiving portions are formed along the length direction on both sides of the base plate in the width direction. A pair of frame members extending from the base end on the interior side of the vehicle to the tip on the rear cargo compartment opening side, which are slidable between a stored state where they are housed within the rail receiving portion and an extended state where their tips are pulled out to the vicinity of the cargo compartment opening, and which have rail grooves formed along their length on their upper surfaces, The mounting body is a board-shaped table having a pair of slide bars that can be fitted into the rail groove along the length of its back surface. The slide bars slide along the rail groove, allowing the table to be freely extended between a stored state, where it is housed in the cargo compartment, and an extended state, where it is pulled out of the cargo compartment through the rear cargo compartment opening. A vehicle cargo compartment structure according to claim 1 or claim 2.
4. The table, when stored in the cargo compartment, has a predetermined length from its base end on the interior side to its tip on the rear cargo compartment opening side. The slide bar is installed in a predetermined area on the underside of the table, from the base end to the tip end, and the tip end of the underside has legs for supporting the table on the mounting surface when the table is pulled out of the cargo compartment. The vehicle cargo compartment structure according to claim 3.
5. When the aforementioned seatback is folded forward, A pair of frame members extend along the length direction from both ends of the base plate in the width direction, The aforementioned mounting body has a frame body consisting of left and right side panels and a top panel, with at least the front being open. The frame body is fixed to the frame material. A vehicle cargo compartment structure according to claim 1 or claim 2.
6. The frame further comprises a drawer section that can be freely pulled out and stored through an opening on the front of the frame body. The vehicle cargo compartment structure according to claim 5.
7. This applies to a vehicle cargo compartment structure in which a cargo compartment with a floorboard is formed between a rear seat and a rear cargo compartment opening, the rear seat having a seat back that is rotatably supported between a seated position in which the occupant can sit and a tilted position in which the seat cushion is tilted forward, and the rear cargo compartment opening. A tether anchor, which is an existing rod-shaped body installed on the back of the tilted seat back and to which a tether belt for securing a child seat is attached, is fixed to the tether anchor by combining a first flange portion located on one side of the tether anchor and a second flange portion located on the other side, which has a base plate on which a base plate for securing a load to be mounted in the cargo compartment is installed, with the two flange portions facing each other. Mounting jig.