A loading/unloading robot comprising: a support unit installed so as to be capable of being raised and lowered in a raising/lowering direction; an arm unit attached to the support unit; and a hand unit for conveying an object to be loaded and unloaded, attached to the arm unit, wherein the support unit includes a base portion that can be revolved around an axis of revolution that extends in said raising/lowering direction and a head portion rotatably attached to the base portion, the arm unit includes an arm (41,51) that is rotatably attached to the head portion, a front end of the arm (41,51) moves forward and backward along a forward/backward direction that passes the head portion, the hand unit includes a loading/unloading hand (61,71) rotatably attached to the front end of the arm (41,51), characterized in that: the head portion includes a base-end portion supported on an upper surface of the base portion that is a head portion installation surface, a front portion including an arm installation surface on which the arm(41,51) is attached, and a stepped portion that integrally joins the base-end portion and the front portion, a height of an upper surface of the front portion that is the arm installation surface is lower than a height of an upper surface of the base-end portion, wherein at least one of the base portion and the head portion includes a rotation restricting member that restricts a range of rotation of the head portion, and a height of the arm installation surface is equal to or lower than a height of the upper surface of the base portion that is the head portion installation surface. a support unit installed so as to be capable of being raised and lowered in a raising/lowering direction; an arm unit attached to the support unit; and a hand unit for conveying an object to be loaded and unloaded, attached to the arm unit, wherein the support unit includes a base portion that can be revolved around an axis of revolution that extends in said raising/lowering direction and a head portion rotatably attached to the base portion, the arm unit includes an arm (41,51) that is rotatably attached to the head portion, a front end of the arm (41,51) moves forward and backward along a forward/backward direction that passes the head portion, the hand unit includes a loading/unloading hand (61,71) rotatably attached to the front end of the arm (41,51), characterized in that: the head portion includes a base-end portion supported on an upper surface of the base portion that is a head portion installation surface, a front portion including an arm installation surface on which the arm(41,51) is attached, and a stepped portion that integrally joins the base-end portion and the front portion, a height of an upper surface of the front portion that is the arm installation surface is lower than a height of an upper surface of the base-end portion, wherein at least one of the base portion and the head portion includes a rotation restricting member that restricts a range of rotation of the head portion, and a height of the arm installation surface is equal to or lower than a height of the upper surface of the base portion that is the head portion installation surface. the head portion includes a base-end portion supported on an upper surface of the base portion that is a head portion installation surface, a front portion including an arm installation surface on which the arm(41,51) is attached, and a stepped portion that integrally joins the base-end portion and the front portion, a height of an upper surface of the front portion that is the arm installation surface is lower than a height of an upper surface of the base-end portion, wherein at least one of the base portion and the head portion includes a rotation restricting member that restricts a range of rotation of the head portion, and a height of the arm installation surface is equal to or lower than a height of the upper surface of the base portion that is the head portion installation surface.