Reciprocating saw having a blade holding device

A reciprocating saw, comprising a main body, a blade holding device mounted on the main body, and a blade detachably mounted on the support seat of the main body by the blade holding device, wherein:

• the main body has a side provided with a support seat having a first end formed with a locking hole and a second end formed with a receiving hole;
• the blade has an end formed with a positioning hole;
• the blade holding device includes a bushing, a slide, a sleeve, a positioning ball, a torsion spring, and a guide rod, wherein:
• the bushing is secured on the support seat of the main body and has an inner wall formed with a longitudinal slide slot and a periphery formed with a longitudinal guide slot communicating with the slide slot;
• the slide is slidably mounted in the slide slot of the bushing and has a side formed with an arcuate concave urging face;
• the sleeve is rotatably mounted on the bushing and has a first end having a periphery formed with a helical guide groove and a second end having a periphery formed with an arc-shaped retaining groove, the first end of the sleeve has an end face formed with a locking hole;
• the positioning ball is movably mounted in the receiving hole of the support seat of the main body and has a first side urged by the urging face of the slide and a second side locked in the positioning hole of the blade;
• the torsion spring is mounted on the support seat of the main body and has a first end inserted into the locking hole of the main body and a second end inserted into the locking hole of the sleeve;
• and
• the guide rod is extended through the guide groove of the sleeve, the guide slot of the bushing and the slide.