VALVE OPENING/CLOSING TIMING CONTROL DEVICE

PROBLEM TO BE SOLVED: To provide a valve opening/closing timing control device which makes a pressure of hydraulic oil in an accumulator smaller than a pressure which is acted on a check valve by a solenoid.SOLUTION: A valve opening/closing timing control device includes: an outer rotor; an inner rotor; a fluid pressure chamber formed by the outer rotor and the inner rotor; a lead angle chamber and a delay angle chamber formed by partitioning the fluid pressure chamber by a partition part; a fluid control valve part 2 performing feeding/discharging of a fluid to the lead angle chamber or the delay angle chamber; an accumulator 110 for accumulating a part of the fluid supplied from a pump to the fluid control valve part 2 in a fluid storage part 115 while an engine is in operation, and for supplying the fluid accumulated in the fluid storage part 115 to the fluid control valve part 2 when the engine starts; and supply flow passages 47 and 48 for circulating the fluid by connecting the pump, the fluid control valve part 2 and the accumulator 110 in series. The accumulator 110 includes a relief control valve part 130 which maintains the pressure of the fluid accumulated in the fluid storage part 115 at a predetermined value or less.