Abstract: A Kármán vortex flowmeter includes a vortex generator 2 provided in a tube-like flow passage 1a, a vortex detector 4 having a piezoelectric element 6 embedded in an elastic sheath 5 having a pressure receiving wing piece 5a, spaced apart by a prescribed distance from the vortex generator, downstream of the flow passage. The vortex detector includes the pressure receiving wing piece of a square plate, and a piezoelectric element accommodating portion 5c of a circular cylinder having a larger outer diameter than the pressure receiving wing piece. The pressure receiving wing piece protrudes from an end face 5c of the piezoelectric element accommodating portion. In this configuration, a Kármán vortex flowmeter with high accuracy can be provided in which the detector itself generate no vortex and can detect vortexes stably.