To provide a Coriolis-type mass flowmeter which has high accuracy and enhanced stability and vibration resistance.

In a Coriolis-type mass flowmeter, a fluid for measurement is made to flow into a vibrating tube 11, and the vibrating tube 11 is deformed and vibrated by a Coriolis force generated by the flow of the fluid for measurement and the angular vibration of the vibrating tube 11. In this case, the Coriolis-type mass flowmeter has the vibrating tube 11 having a plurality of curved part 13 arranged in line symmetry with respect to a straight line held at equal distances from an upstream fixed end 7 and a downstream fixed end 8, the vibrating tube 11 vibrating in a secondary mode of resonance in which it is almost fixed at each end within one plane in which its entire body is contained.