To provide a pressure sensor 1 having good sensitivity without increasing an addition amount of conductive particles of a pressure-sensitive conductive sheet.

A pressure sensor 1 comprises: an insulating substrate 2; an organic transistor 10 provided on one principal surface of the insulating substrate 2; a voltage power supply 30 that applies a predetermined voltage to a source electrode 12 of the organic transistor 10; a pressure-sensitive conductive body 20 that is provided between the voltage power supply 30 and the source electrode 12 and is connected in series with the source electrode 12; and a pressing sheet 60 laminated on one principal surface side of the pressure-sensitive conductive body. The pressure-sensitive conductive body 20 and the pressing sheet 60 have at least portions (recess parts 62) that are in noncontact with each other, and the other portions (protrusion parts 61) that are in contact with each other.