A structure for joining two resin parts, comprising: one resin part (14, 62) having an engaged portion (18, 72) at an end portion of the one resin part (14, 62), the engaged portion (18, 72) being bent and formed in a hook shape, wherein the engaged portion (18, 72) comprises: an inner wall, a first side wall (20, 74) that connects the inner wall and the end portion of the one resin part (14, 62), a fit-together hole (26, 64) provided at the an inner wall; and a first extending piece (28, 30, 66) that is disposed at a peripheral edge portion of the fit-together hole (26, 64) and extends-out from the first side wall (20, 74); and another resin part (16, 68), that is to be made integral with the one resin part (14, 62), the other resin part (16, 68) comprising: an abutment wall (42, 76) that is bent at an end portion of the other resin part (16, 68); and a second extending piece (44, 46, 70) that extends-out from a distal end portion of the abutment wall (42, 76), wherein the abutment wall (42, 76) abuts the first side wall (20, 74) of the engaged portion (18, 72), and the second extending piece (44, 46, 70) abuts the first extending piece (28, 30, 66) in a state in which the second extending piece (44, 46, 70) has been inserted in the fit-together hole (26, 64) of the engaged portion (18, 72) and the abutment wall (42, 76) is abutted the first side wall (20, 74), and characterized in that the first extending piece (28, 30, 66) extends-out toward an opposite side from the abutment wall (42, 76) of the other resin part (16, 68), with the inner wall of the one resin part (14, 62) being interposed between the first extending piece (28, 30, 66) and the abutment wall (42, 76), in a state in which the other resin part (16, 68) is made integral with the one resin part (14, 62). one resin part (14, 62) having an engaged portion (18, 72) at an end portion of the one resin part (14, 62), the engaged portion (18, 72) being bent and formed in a hook shape, wherein the engaged portion (18, 72) comprises: an inner wall, a first side wall (20, 74) that connects the inner wall and the end portion of the one resin part (14, 62), a fit-together hole (26, 64) provided at the an inner wall; and a first extending piece (28, 30, 66) that is disposed at a peripheral edge portion of the fit-together hole (26, 64) and extends-out from the first side wall (20, 74); and an inner wall, a first side wall (20, 74) that connects the inner wall and the end portion of the one resin part (14, 62), a fit-together hole (26, 64) provided at the an inner wall; and a first extending piece (28, 30, 66) that is disposed at a peripheral edge portion of the fit-together hole (26, 64) and extends-out from the first side wall (20, 74); another resin part (16, 68), that is to be made integral with the one resin part (14, 62), the other resin part (16, 68) comprising: an abutment wall (42, 76) that is bent at an end portion of the other resin part (16, 68); and a second extending piece (44, 46, 70) that extends-out from a distal end portion of the abutment wall (42, 76), an abutment wall (42, 76) that is bent at an end portion of the other resin part (16, 68); and a second extending piece (44, 46, 70) that extends-out from a distal end portion of the abutment wall (42, 76), wherein the abutment wall (42, 76) abuts the first side wall (20, 74) of the engaged portion (18, 72), and the second extending piece (44, 46, 70) abuts the first extending piece (28, 30, 66) in a state in which the second extending piece (44, 46, 70) has been inserted in the fit-together hole (26, 64) of the engaged portion (18, 72) and the abutment wall (42, 76) is abutted the first side wall (20, 74), and characterized in that the first extending piece (28, 30, 66) extends-out toward an opposite side from the abutment wall (42, 76) of the other resin part (16, 68), with the inner wall of the one resin part (14, 62) being interposed between the first extending piece (28, 30, 66) and the abutment wall (42, 76), in a state in which the other resin part (16, 68) is made integral with the one resin part (14, 62).