Abstract: A replaceable saw comprises a saw blade having saw teeth and an insertion portion, a notch being formed in the insertion portion so as to extend in a direction in which the saw blade is inserted, a support member which supports the insertion portion of the saw blade via a blade replacing mechanism and which includes a pair of installation pieces defining an insertion gap into which the insertion portion can be inserted, a through hole formed in one of the installation pieces, an attaching nut formed in the other installation piece, and an attaching bolt inserted through the through hole and the notch and which can be screwed into the attaching nut, and a handle connected to the support member via a rotational position adjusting mechanism comprising a pair of branching portions formed in the handle so as to sandwich the support member between them, a through hole formed in one of the branching portions, a nut mounted in the other branching portion, a supporting hole formed in the support member, and a pivoting