A blade attachment/detachment mechanism for detachably attaching a blade to a saber saw. An end portion of the blade is formed with a blade hole. A reciprocally movable plunger has a blade attachment end portion where a slit and a stepped hole are formed. The slit extends in a longitudinal direction of the blade, and the stepped hole extends in a direction perpendicular to the slit and intersects the slit. An engagement pin is provided in the stepped hole. The engagement pin is engageable with the blade hole to fix the blade to the plunger when the blade end is inserted into the slit. For moving the engagement pin, a knob is pivotally supported to the blade attachment end portion, and a torsion spring is provided to bias the knob in a blade attaching direction. The knob has a slanted surface in engagement with the engagement pin. When the knob is pivotally moved to the blade attaching direction by the biasing force of the torsion spring, the slanted surfaces pushes the engagement pin to maintain engagement with the blade hole. When the knob is manually moved in an opposite direction, the urging force of the slanted surface toward the engagement pin is reduced. The engagement pin is also biased by a compression spring, so that the engagement pin is disengaged from the blade hole by the biasing force of the compression spring.
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