Flow rate measurement device

A flow rate measurement device that is inserted into a through-hole which is disposed in piping, and measures a flow rate of a fluid to be measured that has a main passage in the piping, the flow rate measurement device comprising:

• a connector that includes a connector terminal which transmits and receives a signal to and from an external device;
• a flow rate detection element that is arranged in a bypass passage in which a part of the fluid to be measured passing through the main passage is taken;
• a circuit board that has a wire bonding pad arranged on one surface and is electrically connected to the connector terminal and the flow rate detection element through wire bonding;
• a circuit board receiving portion that supports and receives the circuit board;
• an environment sensor that is mounted on the other surface of the circuit board and measures at least one of temperature, humidity, and pressure of the fluid to be measured;
• and
• a measuring chamber that is disposed in the circuit board receiving portion, the environment sensor being arranged in the measuring chamber,
• wherein the measuring chamber has a communication port for communication with the main passage.