A turbine flowmeter comprises an impeller which has a rotary shaft rotatable together with the impeller and is provided within a flow passage through which a fluid to be measured flows, a pair of bearing members for axially supporting the rotary shaft, an oil accumulating part provided in a vicinity of the bearing member for holding a lubricating oil therein, and an oil supplying part for supplying the lubricating oil in the oil accumulating part in small quantities to at least one of the bearing members.
