A chain case structure of an engine, wherein, when a chain case is viewed in the crankshaft direction, both side portions of a mount bracket unit in {HEAD ~ the width direction} extend to the left edge portion or the right edge portion of the chain case and the upper edge portion of {TAIL ~ the chain case}, and a fastening portion to an engine main body is provided on the lower portion of the mount bracket portion 
A chain case structure of an engine , wherein , when a chain case is viewed in the crankshaft direction , both side portions of a mount bracket unit in { HEAD ~ the width direction } extend to the left edge portion or the right edge portion of the chain case and the upper edge portion of { TAIL ~ the chain case } , and a fastening portion to an engine main body is provided on the lower portion of the mount bracket portion
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