To provide a blade guide apparatus in which a guide member does not shift, its mounting position can easily be changed, and teeth of a blade can be used thoroughly.

A blade mounting part is composed of a cover for covering the blade mounting part attached to an output rod reciprocated by a driving source, and a guide member attached to the cover so as to advance and retreat. The guide member is composed of a guide part for abutting on an object to be machined, and an engage fixing part for fixing the position of the guide part by engaging with engaging holes formed in the cover.