A valve timing controller includes a guide rotation member provided with a
guide groove, a bearing rotation member radially supporting the guide
rotation member, and a plurality of movable bodies sliding in the guide
groove in accordance with a rotation of the guide rotation member. A
plurality of link mechanisms connects the bearing rotation member with
each one of movable bodies respectively, and rotates the bearing rotation
member in accordance with a movement of the movable bodies. The valve
timing of at least one of the intake valve and the exhaust valve is
adjusted in accordance with a rotation of the bearing rotation body. A
clearance gap is provided between the guide rotation member and the
bearing rotation member in order to permit a relative radial movement of
the guide rotation member with respect to the bearing rotation member.