Abstract: Provided between a housing (2) and a paint cartridge (20) is a magnetic holding mechanism (32) composed of a permanent magnet (33) provided on a bottom surface (4A) of a cartridge mount portion (4) and a magnetic member (34) provided on a front surface (21A) of a container (21) of the paint cartridge (20). As the container (21) is fitted on the cartridge mount portion (4), the paint cartridge (20) can be fixedly and securely held on the housing (2) by magnetic attraction between the permanent magnet (33) and the magnetic member (34). Accordingly, even if a trouble occurs to one of components which are operatively connected with the cartridge type coating machine (1), the paint cartridge (20) can be securely retained on the housing (2) by the magnetic holding mechanism (32).