Vehicle back door

Abstract

To provide a vehicle back door capable of suppressing falling down of rain water on both sides of an outer panel in a vehicle width direction in a fully opened state without damage to its appearance.SOLUTION: A panel upper part 23 of an outer panel 21 has a base surface 23a on which a rear spoiler is mounted, and a step surface 23b that forms a step between a rear window 30 and the base surface 23a. The base surface 23a and the step surface 23b, in a fully closed state, are covered by the rear spoiler. The step surface 23b, in a fully opened state, is bent such that both end parts in a vehicle width direction are positioned below a center part. On the panel upper part 23, recesses 51 and 52, which are recessed from the step surface 23b in a fully opened state and are opened on the base surface 23a, are provided. Inner bottom surfaces 51a and 52a of the recesses 51 and 52, in a fully opened state, are inclined downward as going forward.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a back door of a vehicle. [Background technology]

[0002] Patent Document 1 discloses a back door of a vehicle. The back door is a flip-up door that opens and closes an opening provided at the rear of the vehicle body by rotating vertically around the upper part of the back door as a rotation axis. The back door includes an outer panel, a rear window attached to the outer panel, and a rear spoiler attached to the outer panel.

[0003] The outer panel has a panel upper portion that is located above the rear window when the outer panel is fully closed. The panel upper portion has a base surface to which the rear spoiler is attached and a step surface that forms a step between the rear window and the base surface. The step surface may be curved so that both ends in the vehicle width direction are located lower than the center when the outer panel is fully open. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2008-37174 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the back door of such a vehicle, in a fully open state, the rear window is inclined downward toward the front so that the upper end is located lower than the lower end of the vehicle. Therefore, when rainwater adheres to the rear window during rainfall, the rainwater flows down along the rear window toward the front of the vehicle and reaches the step surface at the upper part of the panel. In a fully open state, the step surface is curved so that both ends in the vehicle width direction are located lower than the center. Therefore, the rainwater flows along the step surface toward both sides in the vehicle width direction. The rainwater that flows to both ends of the outer panel in the vehicle width direction may drip into the vehicle interior after running along the surface of the outer panel on the passenger compartment side. In this case, the vehicle interior becomes wet. In addition, the back door is a member that is visible to the user of the vehicle. For the above reasons, it is required to suppress rainwater from flowing down both sides of the outer panel in the vehicle width direction in a fully open state without impairing the appearance of the back door. [Means for solving the problem]

[0006] A vehicle tailgate for solving the above problems is a flip-up type vehicle tailgate that opens and closes an opening provided at the rear of a vehicle body, and comprises an outer panel, a rear window attached to the outer panel, and a rear spoiler attached to the outer panel, wherein the outer panel has a panel upper portion that is located above the rear window when fully closed, the panel upper portion has a base surface to which the rear spoiler is attached and a step surface that forms a step between the rear window and the base surface, the base surface and the step surface are covered by the rear spoiler when fully closed, and the step surface is curved so that both ends in the vehicle width direction of the vehicle are located lower than the center when fully open, and the panel upper portion is provided with a recess that is recessed from the step surface and opens at the base surface when fully open, and the inner bottom surface of the recess is inclined downward as it approaches the front when fully open.

[0007] According to the above configuration, a recess is provided in the panel upper portion of the outer panel, which is recessed from the step surface in the fully open state. Therefore, in the fully open state, rainwater flowing along the step surface toward both sides in the vehicle width direction enters the recess. In the fully open state, the recess is open at the base surface. In addition, in the fully open state, the inner bottom surface is inclined downward toward the front. As a result, in the fully open state, the inner bottom surface is inclined downward toward the front. Therefore, the rainwater that enters the recess is guided to the front of the vehicle by the inner bottom surface. In other words, the recess changes the flow direction of the rainwater from the direction toward both sides in the vehicle width direction to the direction toward the front of the vehicle. Therefore, in the fully open state, the rainwater is suppressed from flowing down to both sides of the outer panel in the vehicle width direction.

[0008] In addition, the base surface and step surface of the upper panel are covered by the rear spoiler when the back door is fully closed. In other words, the recess is provided in a portion of the upper panel that is hidden behind the rear spoiler. Therefore, even if the recess is provided in the outer panel, it does not affect the appearance of the back door. Therefore, it is possible to prevent rainwater from flowing down both sides of the outer panel in the vehicle width direction when the back door is fully open without compromising the appearance.

[0009] In the back door of the vehicle, the recess may be provided at both ends of the step surface in the vehicle width direction. As described above, rainwater flows along the step surface toward both sides in the vehicle width direction. Therefore, the rainwater collects at both ends of the step surface in the vehicle width direction. According to the above configuration, the recesses are provided at both ends of the step surface in the vehicle width direction. Therefore, the recesses allow the rainwater that has collected at both ends of the step surface in the vehicle width direction to flow forward of the vehicle. Therefore, it is possible to efficiently prevent the rainwater from flowing down to both sides of the outer panel in the vehicle width direction.

[0010] In the back door of the vehicle, the recessed portion may be provided in a plurality of portions from a center portion of the step surface to each end portion in the vehicle width direction. According to the above configuration, the recesses are provided from the center of the step surface in the vehicle width direction to each end. Therefore, even if some of the rainwater passes over the recesses located at the center in the vehicle width direction among the multiple recesses, the rainwater is blocked by the recesses located at the ends in the vehicle width direction. Therefore, it is possible to further prevent the rainwater from flowing down to both sides of the outer panel in the vehicle width direction.

[0011] In the back door of the above-mentioned vehicle, of the multiple recesses provided from the center to the end of the step surface in the vehicle width direction, the recess located at the end side is defined as an outer recess, and of a pair of inner surfaces facing each other in the vehicle width direction of the outer recess, one of the inner surfaces located at the end side in the vehicle width direction may be perpendicular to the inner bottom surface of the outer recess.

[0012] According to the above configuration, one of the pair of inner surfaces of the outer recess, which is located at the end in the vehicle width direction, stands upright relative to the inner bottom surface of the outer recess. Therefore, compared to a case in which the one inner surface is inclined relative to the inner bottom surface so that the angle between the one inner surface and the inner bottom surface is an obtuse angle, rainwater is less likely to climb over the outer recess. Therefore, it is possible to further prevent rainwater from flowing down to both sides of the outer panel in the vehicle width direction. Effect of the Invention

[0013] According to the present invention, it is possible to prevent rainwater from flowing down both sides of the outer panel in the vehicle width direction when the door is fully open, without compromising the appearance. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a perspective view showing the rear of a vehicle. [Diagram 2] FIG. 2 is a side view showing the rear of the vehicle. [Diagram 3] FIG. 3 is an exploded perspective view showing the back door. [Figure 4] FIG. 4 is an enlarged plan view showing an upper portion of the outer panel. [Diagram 5]FIG. 5 is a perspective view showing the back door in a fully open state. [Figure 6] FIG. 6 is a diagram showing the flow of rainwater. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] An embodiment of a vehicle back door will be described below with reference to Figs. 1 to 6. In the following description, "front", "rear", "left", "right", "up" and "down" refer to the state in which the driver of the vehicle faces forward (forward direction). The left-right direction coincides with the vehicle width direction.

[0016] <Vehicle> As shown in Fig. 1 and Fig. 2, a vehicle 10 includes a vehicle body 11 and a back door 12. An opening 11a is formed in the rear of the vehicle body 11. The back door 12 is located in the rear of the vehicle 10. An upper portion of the back door 12 is attached to a portion of the vehicle body 11 located above the opening 11a via a hinge (not shown). The back door 12 is a flip-up door that opens and closes the opening 11a by rotating in the vertical direction of the vehicle 10 around the upper portion of the back door 12 as the center of rotation.

[0017] <Backdoor> The back door 12 includes a door body 20, a rear window 30, and a spoiler 40.

[0018] The door body 20 has an outer panel 21 and an inner panel 22. The outer panel 21 constitutes a wall portion on the vehicle outer side of the door body 20. The inner panel 22 constitutes a wall portion on the vehicle inner side of the door body 20. The outer panel 21 and the inner panel 22 are each in the form of a thin metal plate.

[0019] As shown in FIG. 3, the rear window 30 is attached to the outer panel 21. The outer panel 21 has a panel upper portion 23 located above the rear window 30 in a fully closed state, and a panel lower portion 24 located below the rear window 30. The rear window 30 and the panel lower portion 24 of the outer panel 21 form the outer surface of the back door 12. In this embodiment, the rear window 30 is tilted forward so that its upper end portion is located further forward of the vehicle 10 than its lower end portion in a fully closed state. The panel upper portion 23 extends in a substantially horizontal direction in a fully closed state. The panel lower portion 24 extends in a substantially vertical direction in a fully closed state.

[0020] The panel upper part 23 has a base surface 23a to which the spoiler 40 is attached, and a step surface 23b that forms a step between the rear window 30 and the base surface 23a. In this embodiment, the base surface 23a forms the upper surface of the panel upper part 23 in the fully closed state. The step surface 23b forms the rear surface of the panel upper part 23 in the fully closed state.

[0021] 3 and 4, a plurality of mounting holes 25 for mounting the spoiler 40 are formed in the base surface 23a. The mounting holes 25 penetrate the panel upper portion 23 in the plate thickness direction. In this embodiment, some of the plurality of mounting holes 25 are provided near recesses 51 and 52 described later.

[0022] 5 and 6, the step surface 23b extends in the vehicle width direction and is curved so that both ends in the vehicle width direction are positioned lower than the center when the door is fully open.

[0023] 3, the spoiler 40 has a rear spoiler 41 and a pair of side spoilers 42. The rear spoiler 41 extends in the vehicle width direction. The pair of side spoilers 42 are located at both ends of the spoiler 40 in the vehicle width direction.

[0024] As shown in Figures 1 and 2, the rear spoiler 41 has a flat upper plate portion 41a, a flat lower plate portion 41b, and a connection portion 41c that connects an edge of the upper plate portion 41a and an edge of the lower plate portion 41b.

[0025] The spoiler 40 is attached to the base surface 23a of the panel upper portion 23. In this embodiment, the spoiler 40 is fixed to the outer panel 21 by a fixing means such as a clip (not shown) attached to the rear spoiler 41 being inserted into the mounting hole 25 from the base surface 23a side and then crimped.

[0026] The upper plate portion 41a of the rear spoiler 41 covers the base surface 23a of the panel upper portion 23 in the fully closed state. In the fully closed state, the upper plate portion 41a constitutes a part of the roof of the vehicle 10. The upper plate portion 41a has a portion located rearward of the vehicle 10 from the base surface 23a. The lower plate portion 41b of the rear spoiler 41 protrudes rearward of the vehicle 10 from the upper end portion of the rear window 30. The step surface 23b of the panel upper portion 23 is located lower than the upper plate portion 41a and higher than the lower plate portion 41b of the rear spoiler 41. The step surface 23b is exposed in a space surrounded by the upper plate portion 41a, the lower plate portion 41b, and the connection portion 41c of the rear spoiler 41. That is, the step surface 23b is covered by the rear spoiler 41 in the fully closed state. In the fully closed state, the base surface 23a and the step surface 23b are surfaces of the panel upper portion 23 that are hidden behind the rear spoiler 41. The pair of side spoilers 42 are disposed along both ends of the rear window 30 in the vehicle width direction.

[0027] A gap of about several millimeters is provided between the spoiler 40 and the outer panel 21. In detail, a gap is provided between the upper plate portion 41a of the rear spoiler 41 and the base surface 23a of the panel upper portion 23, between the lower plate portion 41b of the rear spoiler 41 and the rear window 30, and between each side spoiler 42 and the rear window 30.

[0028] <Concave> As shown in FIG. 5 and FIG. 6, the panel upper portion 23 is provided with recesses 51, 52 that are recessed from the step surface 23b and open on the base surface 23a in the fully open state. In this embodiment, the recesses 51, 52 are provided one each from the center to the left end of the step surface 23b in the vehicle width direction. Also, the recesses 51, 52 are provided one each from the center to the right end of the step surface 23b in the vehicle width direction. That is, in this embodiment, two recesses 51, 52 are provided from the center to each end of the step surface 23b in the vehicle width direction. With regard to the two recesses 51, 52 provided from the center to each end of the step surface 23b in the vehicle width direction, the recess 51 located on the center side is sometimes referred to as the inner recess 51, and the recess 52 located on the end side is sometimes referred to as the outer recess 52. In this embodiment, the outer recess 52 is provided at both ends of the step surface 23b in the vehicle width direction.

[0029] As shown in FIG. 6, each inner recess 51 is defined by an inner bottom surface 51a and a pair of inner side surfaces 51b, 51c connecting the inner bottom surface 51a and the step surface 23b. The inner bottom surface 51a is inclined downward toward the front in the fully open state. Therefore, the depth of the inner recess 51 from the step surface 23b becomes deeper toward the front in the fully open state. The pair of inner side surfaces 51b, 51c face each other in the vehicle width direction. The distance between the pair of inner side surfaces 51b, 51c becomes wider from the bottom side of the inner recess 51 toward the opening side.

[0030] Each outer recess 52 is defined by an inner bottom surface 52a and a pair of inner sides 52b, 52c connecting the inner bottom surface 52a and the step surface 23b. The inner bottom surface 52a is inclined downward toward the front in the fully open state. Therefore, the depth of the outer recess 52 from the step surface 23b becomes deeper toward the front in the fully open state. The pair of inner sides 52b, 52c face each other in the vehicle width direction. Of the pair of inner sides 52b, 52c, one inner side 52b located at the end side in the vehicle width direction is upright with respect to the inner bottom surface 52a. Of the pair of inner sides 52b, 52c, the other inner side 52c located at the center side in the vehicle width direction is inclined away from the one inner side 52b as it moves from the bottom side of the outer recess 52 toward the opening side.

[0031] In this embodiment, the width of the outer recess 52 in the vehicle width direction is wider than the width of the inner recess 51 in the vehicle width direction. Also, the depth of the outer recess 52 from the step surface 23b is deeper than the depth of the inner recess 51 from the step surface 23b. Therefore, the volume of the outer recess 52 is larger than the volume of the inner recess 51.

[0032] [Operation of this embodiment] The operation of this embodiment will now be described. As shown in Figs. 2 and 5, when the back door 12 is fully open, the rear window 30 is inclined downward toward the front so that the upper end is located lower than the lower end. The base surface 23a of the panel upper portion 23 extends in a substantially vertical direction. The step surface 23b of the panel upper portion 23 is curved so that both ends in the vehicle width direction are located lower than the center portion. The panel lower portion 24 extends in a substantially horizontal direction. As shown in Fig. 1, the front edge portion 21a of the outer panel 21 is located above a portion of the vehicle body 11 that is located above the opening 11a. In other words, the outer panel 21 is located above the vehicle body 11.

[0033] 5 and 6, rainwater adhering to the rear window 30 flows down along the rear window 30 toward the front of the vehicle 10, and reaches the step surface 23b of the panel upper portion 23. Then, as shown by arrow R2, the rainwater flows along the step surface 23b toward both sides in the vehicle width direction.

[0034] The panel upper portion 23 is provided with recesses 51, 52 that are recessed from the step surface 23b in the fully open state. Therefore, in the fully open state, rainwater flowing along the step surface 23b toward both sides in the vehicle width direction enters the recesses 51, 52. In detail, rainwater adhering to a portion of the rear window 30 that is located closer to the center than the inner recess 51 in the vehicle width direction enters the inner recess 51. Rainwater adhering to a portion of the rear window 30 that is located closer to the edge than the inner recess 51 in the vehicle width direction enters the outer recess 52.

[0035] In the fully open state, the recesses 51, 52 are open at the base surface 23a. In addition, in the fully open state, the inner bottom surfaces 51a, 52a of the recesses 51, 52 are inclined downward toward the front. As a result, in the fully open state, the inner bottom surfaces 51a, 52a are inclined downward toward the front. Therefore, as shown by the arrow R3 in FIG. 6, rainwater that enters the recesses 51, 52 is guided to the front of the vehicle 10 by the inner bottom surfaces 51a, 52a.

[0036] In this way, the flow direction of rainwater is changed by the recesses 51, 52 from a direction toward both sides in the vehicle width direction to a direction toward the front of the vehicle 10. Therefore, rainwater is less likely to flow down on both sides of the outer panel 21 in the vehicle width direction. As a result, rainwater is less likely to drip into the passenger compartment 13. Since the front edge 21a of the outer panel 21 is located above the vehicle body 11, rainwater guided to the front of the vehicle 10 by the recesses 51, 52 flows down from the front edge 21a onto the vehicle body 11. In other words, the rainwater guided to the front of the vehicle 10 by the recesses 51, 52 is prevented from dripping into the passenger compartment 13.

[0037] In this embodiment, two recesses, an inner recess 51 and an outer recess 52, are provided from the center to each end of the panel upper portion 23 in the vehicle width direction. Therefore, even if some of the rainwater flows over the inner recess 51, it can be blocked by the outer recess 52.

[0038] In the fully closed state, the base surface 23a and the step surface 23b of the panel upper portion 23 are covered by the rear spoiler 41. That is, the recesses 51, 52 are provided in a portion of the panel upper portion 23 that is hidden behind the rear spoiler 41. Therefore, even if the recesses 51, 52 are provided in the outer panel 21, the appearance of the back door 12 is not affected.

[0039] [Effects of this embodiment] The effects of this embodiment will be described. (1) The panel upper portion 23 of the outer panel 21 is provided with recesses 51, 52 recessed from the step surface 23b in the fully open state. Therefore, in the fully open state, rainwater flowing along the step surface 23b toward both sides in the vehicle width direction enters the recesses 51, 52. In the fully open state, the recesses 51, 52 open at the base surface 23a. In addition, the inner bottom surfaces 51a, 52a of the recesses 51, 52 are inclined downward toward the front in the fully open state. As a result, in the fully open state, the inner bottom surfaces 51a, 52a are inclined downward toward the front. Therefore, the rainwater that enters the recesses 51, 52 is guided to the front of the vehicle 10 by the inner bottom surfaces 51a, 52a. In other words, the direction of the flow of the rainwater is changed by the recesses 51, 52 from the direction toward both sides in the vehicle width direction to the direction toward the front of the vehicle 10. Therefore, in the fully open state, rainwater is prevented from flowing down on both sides of the outer panel 21 in the vehicle width direction.

[0040] In addition, the base surface 23a and the step surface 23b of the panel upper portion 23 are covered by the rear spoiler 41 in the fully closed state. That is, the recesses 51, 52 are provided in a portion of the panel upper portion 23 that is hidden behind the rear spoiler 41. Therefore, even if the recesses 51, 52 are provided in the outer panel 21, it does not affect the appearance of the back door 12. Therefore, it is possible to prevent rainwater from flowing down both sides of the outer panel 21 in the vehicle width direction in the fully open state without impairing the appearance.

[0041] Furthermore, the recesses 51, 52 improve the rigidity of the outer panel 21. Therefore, the outer panel 21 is less likely to flap. (2) As described above, rainwater flows along the step surface 23b toward both sides in the vehicle width direction. Therefore, the rainwater gathers at both ends of the step surface 23b in the vehicle width direction. In this embodiment, outer recesses 52 are provided at both ends of the step surface 23b in the vehicle width direction. Therefore, the outer recesses 52 allow the rainwater that has gathered at both ends of the step surface 23b in the vehicle width direction to flow forward of the vehicle 10. Therefore, it is possible to efficiently prevent the rainwater from flowing down to both sides of the outer panel 21 in the vehicle width direction.

[0042] (3) In this embodiment, two recesses, the inner recess 51 and the outer recess 52, are provided from the center to each end of the step surface 23b in the vehicle width direction. Therefore, even if some of the rainwater passes over the inner recess 51 located on the center side in the vehicle width direction, the rainwater is blocked by the outer recess 52 located on the end side in the vehicle width direction. This makes it possible to further prevent the rainwater from flowing down to both sides of the outer panel 21 in the vehicle width direction.

[0043] (4) In the present embodiment, of the pair of inner side surfaces 52b, 52c of the outer recess 52, the one inner side surface 52b located at the end side in the vehicle width direction stands upright with respect to the inner bottom surface 52a. Therefore, compared to a case in which the one inner side surface 52b is inclined with respect to the inner bottom surface 52a so that the angle between the one inner side surface 52b and the inner bottom surface 52a is an obtuse angle, rainwater is less likely to climb over the outer recess 52. This makes it possible to further prevent rainwater from flowing down to both sides of the outer panel 21 in the vehicle width direction.

[0044] (5) When some of the rainwater passes over the inner recess 51, the rainwater that has passed over the inner recess 51 also flows into the outer recess 52. In this embodiment, the volume of the outer recess 52 is larger than the volume of the inner recess 51. For this reason, even if some of the rainwater passes over the inner recess 51, the rainwater is less likely to overflow from the outer recess 52. This makes it possible to further prevent the rainwater from flowing down to both sides of the outer panel 21 in the vehicle width direction.

[0045] (6) As described above, the outer panel 21 is less likely to flap due to the improved rigidity of the recesses 51, 52. In particular, the outer panel 21 is less likely to flap due to the improved rigidity of the portions of the outer panel 21 near the recesses 51, 52. In this embodiment, the mounting hole 25 to which the spoiler 40 is attached is provided near the recesses 51, 52. That is, the spoiler 40 is attached to a portion of the outer panel 21 that is less likely to flap. This reduces the load on a fixing means, such as a clip, for fixing the spoiler 40 to the outer panel 21.

[0046] (7) The shape of the outer panel 21, which is an existing part of the back door 12, is devised to prevent rainwater from flowing down both sides of the outer panel 21 in the vehicle width direction. Therefore, it is possible to avoid the complication of the configuration of the back door 12 and the increase in cost that may occur when, for example, a new part is added to prevent rainwater from flowing down both sides of the outer panel 21 in the vehicle width direction.

[0047] (8) The recesses 51, 52 are provided in portions that do not affect the appearance of the back door 12. Therefore, the formation positions and number of the recesses 51, 52 can be set to appropriate positions and numbers.

[0048] [Example of change] The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other to the extent that no technical contradiction occurs.

[0049] The number of recesses provided in the outer panel 21 may be changed as appropriate. The positions at which the recesses 51, 52 are formed in the vehicle width direction may be changed as appropriate. The outer recesses 52 do not have to be provided at both ends of the step surface 23b in the vehicle width direction.

[0050] In the above embodiment, two recesses, the inner recess 51 and the outer recess 52, are provided from the center to each end of the step surface 23b in the vehicle width direction, but this is not limited to this. Only one recess may be provided from the center to each end of the step surface 23b in the vehicle width direction, or three or more recesses may be provided.

[0051] One of the inner side surfaces 52b of the outer recess 52 does not have to be perpendicular to the inner bottom surface 52a. For example, the one of the inner side surfaces 52b may be inclined with respect to the inner bottom surface 52a so that the angle between the one of the inner side surfaces 52b and the inner bottom surface 52a is an obtuse angle.

[0052] The volume of the outer recess 52 may be the same as the volume of the inner recess 51 , or may be smaller than the volume of the inner recess 51 . The mounting holes 25 do not have to be provided in the vicinity of the recesses 51, 52. The positions of the mounting holes 25 relative to the base surface 23a may be changed as appropriate.

[0053] The spoiler 40 does not have to include the pair of side spoilers 42. [Explanation of symbols]

[0054] 10...vehicle, 11...vehicle body, 11a...opening, 12...tailgate, 21...outer panel, 23...upper part of panel, 23a...base surface, 23b...step surface, 30...rear window, 41...rear spoiler, 51...inner recess as recess, 51a...inner bottom surface, 52...outer recess as recess, 52a...inner bottom surface, 52b...inner side surface, 52c...inner side surface.

Claims

1. A flip-up type vehicle back door that opens and closes an opening provided at the rear of a vehicle body, an outer panel; a rear window attached to the outer panel; and a rear spoiler attached to the outer panel; the outer panel has a panel upper portion that is located above the rear window in a fully closed state, the panel upper portion has a base surface to which the rear spoiler is attached and a step surface that forms a step between the rear window and the base surface, the base surface and the step surface are covered by the rear spoiler in a fully closed state, the step surface is curved such that both ends in a vehicle width direction of the vehicle are positioned lower than a center portion in a fully opened state, a recessed portion is provided in the upper portion of the panel, the recessed portion being recessed from the step surface and opening at the base surface in a fully open state; A vehicle back door, wherein an inner bottom surface of the recess is inclined downward toward the front when the back door is fully open.

2. The vehicle back door according to claim 1 , wherein the recess is provided at both ends of the step surface in the vehicle width direction.

3. 3. The back door of a vehicle according to claim 1, wherein a plurality of the recesses are provided from a center portion of the step surface to each end portion in the vehicle width direction.

4. Among the plurality of recesses provided from the center to the end of the step surface in the vehicle width direction, the recesses located on the end side are defined as outer recesses, The vehicle back door according to claim 3 , wherein of a pair of inner surfaces of the outer recess facing each other in the vehicle width direction, one of the inner surfaces located at an end side in the vehicle width direction is perpendicular to the inner bottom surface of the outer recess.

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