(57) [Abstract] Objective even at high speeds, it is possible to prevent an abnormal rise in the oil level in the first 2 of the casing that contains the high-speed gear, is possible to reduce the power loss due to stirring resistance, The present invention is to provide a casing structure of a transmission that prevents a decrease in lubricating performance and the oil service life by increasing the heat dissipation of the oil. [Configuration] The first casing accommodating the low-speed gear 2 When, and a second casing 4 accommodating the high-speed gear, is provided first casing 2 and the oil hole 22 of the oil A in the lower part of the partition wall 3 back and forth between the second casing 4, the first were of the casing 2 and the inner and outer double wall structure, and constitutes an oil passage 33 between its inner and outer peripheral walls 31 and 32, an oil derived for inducing the oil A in the second casing 4 to the oil passage 33 to the upper portion of the partition wall 3 The hole 36 is provided, the oil in the oil passage 33 to the first inner circumferential wall 31 of the casing 2 the first casing 2 The inner peripheral wall 31 and the oil return hole 38 back on the inside is provided of.
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