Flow rate measuring device

A flow rate measuring device comprising:

• a flow rate detection unit configured to detect a flow rate of a fluid to be measured the fluid to be measured is the fluid flowing through a main flow path;
• a physical property detection unit configured to detect a physical property of the fluid to be measured, the physical property detection unit comprising a heating unit configured to heat the fluid to be measured and a temperature detection unit configured to detect a temperature of the fluid to be measured;
• a sub-flow path portion in which one end is in fluid communication with a first inflow port open in the main flow path and the other end is in fluid communication with a first outflow port open in the main flow path, the sub-flow path portion comprising a physical property detection flow path in which the physical property detection unit is disposed;
• and
• a flow rate correction unit configured to correct the flow rate of the fluid to be measured, the flow rate being calculated based on a detection signal outputted from the flow rate detection unit, by using the physical property of the fluid to be measured, the physical property being calculated based on a detection signal outputted from the physical property detection unit, wherein
• the heating unit and the temperature detection unit are disposed side by side in a direction orthogonal to a flow direction of the fluid to be measured, and
• the flow rate detection unit is disposed at a position except for the physical property detection flow path.