A bicycle drive unit is basically provided with a crankshaft and a housing. The housing includes a synthetic resin first portion, a synthetic resin second portion and a metallic third portion. The synthetic resin first portion supports a first end of the crankshaft. The synthetic resin second portion supports a second end of the crankshaft. The metallic third portion is disposed in between the synthetic resin first portion and the synthetic resin second portion. The metallic third portion defines an internal space of the housing along with the synthetic resin first portion and the synthetic resin second portion.