Ultrasonic flow meter having one or more integrally molded partition plates dividing the measurement path and having thinner upstream and downstream edges

An ultrasonic flow meter comprising:

• a measurement flow path where a cross section of the measurement flow path through which a fluid to be measured flows is rectangular;
• one or more partition plates that divide the measurement flow path into a plurality of layered flow paths;
• a pair of ultrasonic sensors that are disposed upstream and downstream on the layered flow paths and are capable of transmitting and receiving an ultrasonic signal;
• and
• a flow rate measuring unit that detects a flow rate of the fluid to be measured based on a propagation time, the propagation time being a time period from when one of the ultrasonic sensors transmits the ultrasonic signal to cause the ultrasonic signal to propagate through the fluid to be measured until when an other one of the ultrasonic sensors receives the ultrasonic signal, wherein
• the measurement flow path and the one or more partition plates are integrally molded, and the one or more partition plates have a thickness toward an inlet side and an outlet side that is thinner from a portion having a maximum thickness at a central part of the measurement flow path,
• wherein the measurement flow path has a gradient that matches the shape of the one or more partition plates, and shapes of the plurality of layered flow paths are same.