A twin clutch type speed-change apparatus (1) is provided that can reduce shift shock by providing a step (h) between dog teeth of a dog clutch provided on a speed-change gear sliding on a shaft.In a twin clutch type speed-change apparatus (1) including a transmission having a plurality of gear pairs disposed between a main shaft (6;7) and a countershaft (9); and a twin clutch (TCL) provided on the main shaft (6;7), a rotational drive force from an engine being connected/disconnected between the transmission and the engine, a dog clutch is provided between an axially slidably attached slidable gear and an axially non-slidably attached non-slidable gear to select a gear pair, for transmitting a rotational drive force, from a plurality of gear pairs. A dog tooth (55,56) of the dog clutch is formed with a step (h) different in axial height from each other between a portion abutted against a lateral wall surface of a dog hole (35) when the rotational drive force is transmitted by the dog clutch and a portion abutted against a lateral wall surface of the dog hole (35) when the rotational drive force is not transmitted by the dog clutch.
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