To provide a connector with a built in filter which allows a filter component to be easily attached or removed and maintains the connection of connector pins without electrically disconnecting the connector pins even when the filter component is removed.

A connector 1 includes: a resin case 2; connector pins 3-1 and 3-2; and a filter mounting substrate 4. Each connector pin 3-1 (3-2) is divided into first and second pin parts 31 and 32, and a first spring part 33 and a second spring part 34 are respectively formed at a divided part of the first pin part 31 and a divided part of the second pin part 32. The filter mounting substrate 4 is formed by mounting a filter component 6 on an insulation substrate 5 and is detachably press-fitted into a space between the first and second spring parts 33 and 34 of the connector pins 3-1 and 3-2 and a bottom part 22 of a housing part 20 of the resin case 2. Conductive lines 71 and 72 are provided at the bottom part 22 of the housing part 20.