A tongue plate includes a grasping portion through which the webbing for restraining an occupant is being inserted and a plate portion including an engaging portion. The engaging portion is integrated with the grasping portion, and extends from the grasping portion, and is able to engage with a buckle device of a vehicle. The grasping portion includes a pair of side surfaces. The side surfaces form a portion of an outer peripheral surface of the grasping portion when viewed from a plate thickness direction of the plate portion, and are arranged one on each side portion in a width direction of the grasping portion. The side surfaces are arranged such that a width dimension of the grasping portion on the engaging portion side of the grasping portion is larger than a width dimension of the grasping portion on a side opposite the engaging portion side of the grasping portion.