A low noise vane rotary type air pump formed by directly coupling a pump mechanism part to a drive motor, wherein a cylinder (103), a rotor (110), and vanes (112) are held by a front plate (unshown) and a rear plate (unshown). The noise of the air pump is reduced by forming the open ends (111b) of vane grooves (111) on the rotor (110) reverse direction side of a line connecting the center (O) of the rotor (110) to the closed ends (111a) of the vane grooves (111), i.e., by disposing the vanes in a 'sloped shoulder' form. |