To provide assembling structure of a sprocket easily assembling a sprocket between a crankshaft and a crank pulley.
In the assembling structure A of an oil pump sprocket 7 and a timing chain sprocket 8 to a crankshaft 2, the oil pump sprocket 7, of which the inner peripheral face has a locked part 71 lockable with a locking part 22, is fitted to a shaft part 21, which is disposed to one end of the crankshaft 2, and of which the outer peripheral face has the locking part 22, a shaft body 9 passes through the timing chain sprocket 8 while positioned coaxially with the oil pump sprocket 7, one end of the shaft body 9 is fitted to the shaft part 21 of the crankshaft 2, and the crank pulley 3 is disposed to the other end of the fitted shaft body 21.
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