An electromagnetic valve for a transmission-use oil pressure control device including an oil pump that supplies oil pressure to a transmission, and an accumulator that accumulates an oil pressure generated by the oil pump. The electromagnetic valve includes: an electromagnetic valve main body connected to the accumulator and includes an oil path opening/closing valve element opening/closing an oil path between the accumulator and the transmission; a seal member disposed in the electromagnetic valve main body sealing against oil leakage from a sliding portion of the oil path opening/closing valve element in the opening/closing operation of the oil path opening/closing valve element; and a pressure regulation mechanism disposed in the electromagnetic valve main body regulating to release an internal pressure in the accumulator when an accumulator-side oil pressure in the electromagnetic valve main body rises to a predetermined pressure or more.
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