To provide an assist suit (10) that achieves both a posture correction effect and a forward bending assisting effect, provides a more comfortable feeling of wearing, and provides less restriction of daily activities, there is provided a spinal member (20) for an assist suit. The member includes a plate-like member having a vertically long shape extending from a back region of the wearer to a buttock region, bending along the back region of the wearer, having elasticity in a bending direction, and differing in width in a longitudinal direction of the plate-like member. The plate-like member includes a part of a portion of the spinal member which is located above a middle portion in a longitudinal direction and narrower than remaining parts, or a part of a portion of the spinal member which is located above a middle portion in a longitudinal direction, with a width near a shoulder blade of the back region of the wearer being narrower than remaining parts.
