A pivoting mechanism includes a rotation assembly and a fixation assembly. The rotation assembly includes a first member and a second member which are rotatable with respect to each other. The fixation assembly includes a first fixation member, a first elastic member, and a first pushing member. The first fixation member is received in the rotation assembly. The first fixation member selectively blocks the first member and the second member. The first fixation member is disposed between the first elastic member and the first pushing member.