There are provided: a female terminal having a cylindrical base portion and a plurality of elastic contact pieces protruding from a plurality of locations of the base portion in a circumferential direction and being elastically deformable; and a male terminal having a tab portion whose outer peripheral surface is formed as a circumferential surface, a radius of curvature of an inner surface of each of the elastic contact pieces is formed larger than a radius of the tab portion, and when the tab portion is inserted into an insertion space surrounded by the plurality of elastic contact pieces, each of the elastic contact pieces is elastically deformed to an outer side, and the tab portion and each of the elastic contact pieces come into contact with each other.