A hinge assembly comprising a movable member 5 and a fixed member 6 rotatably connected to each other and a coiled spring (not shown) biasing the movable member 5 toward the fixed member 6. A receiving recess 11 is formed in an opposing surface 5b of the movable member 5 facing the fixed member 6. A spherical body 8 is received in the receiving recess 11 such that the spherical body 8 is movable in a circumferential direction of the movable member 5. A first cam portion 13a is formed in an opposing surface of the fixed member 6 facing the movable member 5. Rotation of the movable member 5 in a direction of an arrow causes the cam portion 13a to be abutted against the spherical body 8. The cam portion 13a converts a biasing force of the coiled spring into a rotational biasing force. The rotational biasing force causes the spherical body 8 to be rapidly abutted against a first hitting portion 11a of the receiving recess 11 and thereby to generate a clicking sound.