To simplify a structure and facilitate assembly, by preventing mutual disconnection even when external force is received after a male hook member is connected to a female hook member, enabling the male hook member to increase load receiving force, preventing easy disconnection of an object connected to the male hook member, and pressing an elastic engaging arm of the male hook member from only a single direction.

A female hook member 1 and a male hook member 2 turnably connected to the female hook member 1 are provided, the female hook member 1 is constituted by a connection seat 10 and a connecting fixture mounting part 14 connected onto the connection seat, in a drum part of the connection seat, a cross direction through-hole 101 is drilled, in a part leading to a lower surface wall of the through-hole from a bottom surface of the connection seat, a connection hole 104 is drilled, in an upper surface wall of the through-hole, a pressing leg 102 is formed, and the male hook member is constituted by a hook main unit 20, end edge part of an elastic engaging arm 24 and a plurality of engaging legs 22, 23 vertically provided in an axial direction in an upper surface of an end edge seat.