Flow-rate measurement apparatus

摘要

A plate-shaped board 5 is arranged so that fluid passages are respectively formed at a sensor-element mounting surface side of the plate-shaped board 5 and at a backside surface side thereof being opposed to the sensor-element mounting surface side, a curved passage portion is provided which is located upstream of the plate-shaped board 5 and changes its direction so as to form a curved line, and the curved passage portion has an outer-side wall surface 10G including a sloping portion 10M that slopes so that, of two edge portions of the outer-side wall surface 10G in a direction perpendicular to board surfaces of the plate-shaped board 5, the edge portion located on a sidewall surface, facing the sensor-element mounting surface, of the curved passage portion is positioned closer to an inner wall surface 10P of the curved passage portion than the edge portion located on a sidewall surface opposed to the first sidewall surface, along the sidewall surfaces.