To obtain a thermal flow meter capable of providing thermal insulation without degrading responsiveness of a temperature detection element. A thermal flow meter 300 of the present invention includes an air flow sensing portion 602 that detects a flow rate by performing heat transfer with a measurement target gas passing through the main passage 124 using a heat transfer surface, a temperature detection element 518 that detects a temperature of the measurement target gas, a circuit package 400 obtained by connecting a processing unit 604 that processes signals of the air flow sensing portion 602 and the temperature detection element 518 to a lead and sealing the processing unit 604 using a first molding resin through a first molding process, and a housing 302 where the circuit package 400 is fixed using a second molding resin through a second molding process, wherein, in the circuit package 400, a thickness of a temperature detecting portion 452 for sealing the temperature detection element 518 is thinner than that of a package body portion 426 for sealing the processing unit 604.