To provide a power transmission structure for a working machine, easy in maintenance work.

A pair of transmission shafts 81, 90 constituting part of a power transmission passage in a transmission case 25 are protruded from the transmission case 25 to an outside 68 and transmission members 83, 84 are mounted over portions of the transmission shafts 81, 90 protruded from the transmission case 25 to the outside 68 so that power can be transmitted via the pair of transmission shafts 81, 90 and the transmission members 83, 84. A cover part 69 is provided for covering the transmission shafts 81, 90 protruded from the transmission case 25 to the outside 68 and the transmission members 83, 84, and the cover part 69 is formed to be freely opened/closed. The transmission members 83, 84 each have a brittle portion 67.

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