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 the width direction extend to {TAIL ~ the left edge portion} or the right edge portion of the chain case and the upper edge portion of the chain case, and a fastening portion to an engine main body is provided on the lower portion of {HEAD ~ 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 the width direction extend to { TAIL ~ the left edge portion } or the right edge portion of the chain case and the upper edge portion of the chain case , and a fastening portion to an engine main body is provided on the lower portion of { HEAD ~ the mount bracket portion }
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