To provide a blade replacing type saw, in which an engaging recessed part is formed on a saw body, and a support shaft part located in an insert gap and engaged with the engaging recessed part is formed on one bent piece, whereby while the saw body 3 is rotated, the engaging recessed part of the saw body can be engaged with the support shaft or detached from it, and also the support shaft part is projected cylindrically, a fastening bolt is inserted and disposed in a cylindrical hole of the support shaft part, and an engagement part is formed to be like a cutout on the other bent piece, whereby the fastening bolt is screwed on the engagement part to engage with a nut member capable of clamping the saw body with the inner surface of the one bent piece, so that the saw body is clamped between the nut member and the inner surface of the one bent piece.

In this blade replacing type saw, a saw handle 1 is provided with a backing metal 2 having an insert gap H where the saw body 3 can be inserted between both bent pieces 2a, 2b bent like an inverted U-shape and opposite to each other, the engaging recessed part 3a is formed on the saw body, and one of the bent pieces is provided with the support shaft part 4 located in the insert gap and engaged with the engaging recessed part.