PURPOSE: To maintain a node part of oscillation of a Coriolis flow meter, which oscillates flow pipes like a tuning fork, stably for a long time with a means at a low cost, which can be interposed easily.

CONSTITUTION: In a Coriolis flow meter, circular flow pipes 6, 7 having the same shape and the same dimension and opened to a support pipe 1, in which the fluid to be measured is flowed and which is partitioned by partitioning plates 4, 5, in parallel with each other are oscillated like a tuning fork by driving means 8, 9. In this Coriolis flow meter, a support plate 14 forming a node part of the flow pipes 6, 7 consists of a support piece 14a and 14b, and it is pressed by bolts 15. Cross section of the flow pipes 6, 7 at a part to be pressed is formed into the elliptic shape having a longer axis in the oscillating direction to move the node part of the oscillation to a position except for the position of the support plate 14.