A shift device comprising: a shift body that includes an elongated lever main body to which a grip portion is assembled, and that is configured to rotate between shift positions; an operation section that is provided at the grip portion and that is configured to be operated; a detent rod that is assembled at the lever main body; a restricting body with which the detent rod engages to restrict movement of the shift body, and that permits movement of the shift body by engagement with the detent rod being released by operation of the operation section; and an engagement portion that is integrally provided at the detent rod and that is configured to engage with the restricting body, wherein: the engagement portion extends toward at least one of a vehicle left side or a vehicle right side from the detent rod; the restricting body is provided at a housing and disposed at least one of a left side or a right side of the shift body, and a detent groove having a specific shape is formed at the restricting body; and the engagement portion is configured to engage with the detent groove such that the engagement portion of the detent rod engages with the detent groove of the restricting body to restrict rotation of the shift body; and rotation of the shift body is permitted by engagement of the engagement portion with the detent groove being released by operation of the operation section, an assembly portion (16, 18) is integrally provided at an outer side portion of the lever main body so as to protrude toward the outer side, and characterized in that an assembled portion is provided at the lower portion of the detent rod, the lower portion being at an opposite side to the operation section in a longitudinal direction of the detent rod, the assembled portion is inserted into the assembly portion (16, 18) from an upper side and penetrates through and fits together with a lower wall of the assembly portion (16, 18), and the assembled portion is thus supported at the assembly portion (16, 18) such that the detent rod is assembled to the lever main body at the outer side of the lever main body. a shift body that includes an elongated lever main body to which a grip portion is assembled, and that is configured to rotate between shift positions; an operation section that is provided at the grip portion and that is configured to be operated; a detent rod that is assembled at the lever main body; a restricting body with which the detent rod engages to restrict movement of the shift body, and that permits movement of the shift body by engagement with the detent rod being released by operation of the operation section; and an engagement portion that is integrally provided at the detent rod and that is configured to engage with the restricting body, wherein: the engagement portion extends toward at least one of a vehicle left side or a vehicle right side from the detent rod; the restricting body is provided at a housing and disposed at least one of a left side or a right side of the shift body, and a detent groove having a specific shape is formed at the restricting body; and the engagement portion is configured to engage with the detent groove such that the engagement portion of the detent rod engages with the detent groove of the restricting body to restrict rotation of the shift body; and rotation of the shift body is permitted by engagement of the engagement portion with the detent groove being released by operation of the operation section, an assembly portion (16, 18) is integrally provided at an outer side portion of the lever main body so as to protrude toward the outer side, and characterized in that an assembled portion is provided at the lower portion of the detent rod, the lower portion being at an opposite side to the operation section in a longitudinal direction of the detent rod, the assembled portion is inserted into the assembly portion (16, 18) from an upper side and penetrates through and fits together with a lower wall of the assembly portion (16, 18), and the assembled portion is thus supported at the assembly portion (16, 18) such that the detent rod is assembled to the lever main body at the outer side of the lever main body. the engagement portion extends toward at least one of a vehicle left side or a vehicle right side from the detent rod; the restricting body is provided at a housing and disposed at least one of a left side or a right side of the shift body, and a detent groove having a specific shape is formed at the restricting body; and the engagement portion is configured to engage with the detent groove such that the engagement portion of the detent rod engages with the detent groove of the restricting body to restrict rotation of the shift body; and rotation of the shift body is permitted by engagement of the engagement portion with the detent groove being released by operation of the operation section, an assembly portion (16, 18) is integrally provided at an outer side portion of the lever main body so as to protrude toward the outer side, and characterized in that an assembled portion is provided at the lower portion of the detent rod, the lower portion being at an opposite side to the operation section in a longitudinal direction of the detent rod, the assembled portion is inserted into the assembly portion (16, 18) from an upper side and penetrates through and fits together with a lower wall of the assembly portion (16, 18), and the assembled portion is thus supported at the assembly portion (16, 18) such that the detent rod is assembled to the lever main body at the outer side of the lever main body.