To take out oil including few foreign substances and supply that to a hydraulic pump, without using a special member, in a hydraulic fluid taking-out structure for a working machine equipped with the hydraulic pump in a transmission case internally provided with a gear transmission mechanism, and structured to take out lubricant oil stored in the transmission case as working fluid and guide that to the hydraulic pump.

A gear transmission mechanism 25 is arranged so as to be close to either one of case walls 21b, 21C opposite to each other in the transmission case 21. The hydraulic pump 50 is attached to the case wall 21c on the side where the gear transmission mechanism 25 partially exists. A bulkhead 21m is provided between the case wall 21c to which the hydraulic pump 50 is attached and the opposite case wall 21b opposite to the case wall 21c. An oil storage chamber h is formed between the opposite case wall 21b and the bulkhead 21m, and the oil storage chamber h and the hydraulic pump 50 are communicated through an oil passage formed in a case so as to be isolated.

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