A fluid pressure drive device (100, 200, 300, 400), comprising: a fluid pressure motor configured to be driven by a working fluid which is supplied from a fluid pressure pump; a pair of main passages (2, 3) connected to the fluid pressure motor, one of the main passages (2, 3) to which the working fluid supplied from the fluid pressure pump is led; and a flushing circuit configured to discharge the working fluid from one of the pair of main passages (2, 3) to a tank, wherein the flushing circuit has: a low pressure selection valve provided between the pair of main passages (2, 3) and configured to be switched by a pressure difference between the pair of main passages (2, 3), the low pressure selection valve being configured to select the main passage on the low pressure side; and a flushing passage configured to lead the working fluid passing through the low pressure selection valve to the tank, and the flushing passage has a first orifice and a bent portion formed on the downstream side of the first orifice characterized in that the flushing passage further has a first flushing hole formed in a linear shape and a second flushing hole formed in a linear shape communicating with each other, the first orifice is provided in the first flushing hole, the bent portion is a communication portion between the first flushing hole and the second flushing hole. a fluid pressure motor configured to be driven by a working fluid which is supplied from a fluid pressure pump; a pair of main passages (2, 3) connected to the fluid pressure motor, one of the main passages (2, 3) to which the working fluid supplied from the fluid pressure pump is led; and a flushing circuit configured to discharge the working fluid from one of the pair of main passages (2, 3) to a tank, wherein the flushing circuit has: a low pressure selection valve provided between the pair of main passages (2, 3) and configured to be switched by a pressure difference between the pair of main passages (2, 3), the low pressure selection valve being configured to select the main passage on the low pressure side; and a flushing passage configured to lead the working fluid passing through the low pressure selection valve to the tank, and the flushing passage has a first orifice and a bent portion formed on the downstream side of the first orifice characterized in that the flushing passage further has a first flushing hole formed in a linear shape and a second flushing hole formed in a linear shape communicating with each other, the first orifice is provided in the first flushing hole, the bent portion is a communication portion between the first flushing hole and the second flushing hole. a low pressure selection valve provided between the pair of main passages (2, 3) and configured to be switched by a pressure difference between the pair of main passages (2, 3), the low pressure selection valve being configured to select the main passage on the low pressure side; and a flushing passage configured to lead the working fluid passing through the low pressure selection valve to the tank, and the flushing passage has a first orifice and a bent portion formed on the downstream side of the first orifice characterized in that the flushing passage further has a first flushing hole formed in a linear shape and a second flushing hole formed in a linear shape communicating with each other, the first orifice is provided in the first flushing hole, the bent portion is a communication portion between the first flushing hole and the second flushing hole. the first orifice is provided in the first flushing hole, the bent portion is a communication portion between the first flushing hole and the second flushing hole.