Provided is a pump mechanism that allows a beverage dispenser to be formed compact in its width direction in spite of inclusion of a plurality of tube pumps. A first tube pump 10 and a second tube pump 20 are disposed on the left and right sides of a motor M on more front side than this motor M in such a manner that a first rotational shaft 13 of a first rotor 12 and a second rotational shaft 23 of a second rotor 22 extend perpendicularly to an output shaft S. A first transmission mechanism 30 for transmitting power outputted from the output shaft S to the first rotor 12 includes a first clutch mechanism configured to transmit rotation of the output shaft S in a first direction to the first rotor 12, but not to transmit rotation of the output shaft in a second direction to the first rotor 12. A second transmission mechanism 40 for transmitting the power outputted from the output shaft S to the second rotor 22 includes a second clutch mechanism configured to transmit the rotation of the output shaft S in the second direction to the second rotor 22, but not to transmit rotation of the output shaft in the first direction to the second rotor 22.