A connector with built-in electronic circuit board includes an electronic circuit board for a sensor, the electronic circuit board including a first connection terminal, an inner case housing the electronic circuit board, and an outer case having a chamber housing the inner case. The connector further includes a second connection terminal extending from inside the chamber to outside the outer case, a third connection terminal disposed in the chamber, and a cable connected to the sensor at one end thereof at outside the outer case and connected to the third connection terminal at the other end thereof. The inner case is sealed by resin in a state of the first connection terminal being exposed. The first connection terminal is connected to the second and third connection terminals. The chamber is closed by a lid.