A pressure sensor includes: a housing having a tubular shape, and including a front end including an opening; a diaphragm that is disposed to close the opening, and is structured to deform depending on a pressure exerted on a front side of the diaphragm, and includes a hole extending rearwardly from a front end face of the diaphragm; a sensor element structured to output a signal varying depending on an amount of the deformation of the diaphragm; and a heat receiver including a first portion and a second portion. The first portion is disposed in the hole of the diaphragm, and is joined with an inner periphery of the diaphragm defining the hole. The second portion is formed integrally with the first portion, and is disposed adjacent to a front end of the first portion, and is structured to cover the front end face of the diaphragm.