To realize the safety and low cost of the belt hooking member of a shoulder belt.

This portable air compressor comprises a compressor body 5 having a motor 4 at one end of a crankcase 3, an air tank 6, and a cover 7 for covering the compressor body. Grip frames 65 are erected from both lateral sides of each of synthetic resin grips 25 disposed at both ends of the compressor body 5, respectively. An intermediate bar 67 is installed between these grip frames. The lower part of the metal belt hooking member 85 having such a width that is stored between the grip frames is inserted into the compressor body side through a space under the intermediate bar. With the lower end of the belt hooking member engaged with the engagement groove 86 formed in the compressor body side lower end part of the grip, the opening of the engagement groove is made to abut on a mounting metal fitting 68 secured to the compressor body and the grip is fixed to the mounting metal fitting.