To provide an electrically-powered hydraulic tool capable of confirming whether or not release of hydraulic pressure is properly performed by operating an oil pressure release lever in a state in which a hydraulic pump 3 and a driving motor 1 are installed on a transmission unit 2 and also lessening mulfunction of an oil pressure release function of the electrically-powered hydraulic tool.

The electrically-powered hydraulic tool is provided with a transmission unit 2 comprising a hydraulic pump 3 having a hydraulic plunger 31 for feeding oil by pressurizing by reciprocating in an oil pressure chamber 32, and hydraulic pressure release valve 35 releasing the hydraulic pressure of the fed oil, a reduction mechanism 22 transmitting the revolution of a driving shaft 11 of the driving motor 1 by reducing speed and an eccentric cam mechanism 23, both of which mechanisms are provided between the hydraulic pump 3 and driving motor 1. The cam mechanism 23 converts the reduced revolution in the reduction mechanism 22 into a reciprocating motion of the hydraulic plunger 31 of the hydraulic pump 3. The hydraulic pressure release lever 8 is oscillatorily installed on the transmission unit 2, and an hydraulic pressure release pin 24, which pushes the release valve 35 of the hydraulic pump 3 to open by oscillation of the release lever 8, is slidably installed on the transmission unit 2.

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