An optical module comprising: a wavelength variable interference filter which includes two reflection films (54, 55) opposite to each other via a gap between the reflection films (54, 55) and an electrostatic actuator portion which is configured to change an amount of the gap between the reflection films (54, 55) by voltage application; and a voltage control portion which is configured to control voltage which is applied to the electrostatic actuator portion, wherein the electrostatic actuator portion includes a first electrostatic actuator and a second electrostatic actuator, and the voltage control portion includes: a bias voltage applying unit which is configured to apply preset bias voltage to the first electrostatic actuator; a gap detection unit which is configured to detect the amount of the gap between the reflection films (54, 55); and a feedback voltage applying unit which is configured to apply feedback voltage corresponding to the gap amount which is detected by the gap detection unit to the second electrostatic actuator, wherein the first electrostatic actuator and the second electrostatic actuator can be driven independently of each other, and the feedback voltage applying unit is configured to apply the feedback voltage to the second electrostatic actuator so that the gap between the reflection films (54, 55) detected by the gap detection unit is a target gap amount of the gap between the reflection films (54, 55), characterized in that the bias voltage applying unit is configured to apply bias voltage to the first electrostatic actuator, so that the sensitivity (R c) with respect to the feedback voltage applied to the second electrostatic actuator required so as to change the amount of the gap by a predetermined gap amount is constant at the time of applying feedback voltage to the second electrostatic actuator regardless of the amount of the target gap. a wavelength variable interference filter which includes two reflection films (54, 55) opposite to each other via a gap between the reflection films (54, 55) and an electrostatic actuator portion which is configured to change an amount of the gap between the reflection films (54, 55) by voltage application; and a voltage control portion which is configured to control voltage which is applied to the electrostatic actuator portion, wherein the electrostatic actuator portion includes a first electrostatic actuator and a second electrostatic actuator, and the voltage control portion includes: a bias voltage applying unit which is configured to apply preset bias voltage to the first electrostatic actuator; a gap detection unit which is configured to detect the amount of the gap between the reflection films (54, 55); and a feedback voltage applying unit which is configured to apply feedback voltage corresponding to the gap amount which is detected by the gap detection unit to the second electrostatic actuator, a bias voltage applying unit which is configured to apply preset bias voltage to the first electrostatic actuator; a gap detection unit which is configured to detect the amount of the gap between the reflection films (54, 55); and a feedback voltage applying unit which is configured to apply feedback voltage corresponding to the gap amount which is detected by the gap detection unit to the second electrostatic actuator, wherein the first electrostatic actuator and the second electrostatic actuator can be driven independently of each other, and the feedback voltage applying unit is configured to apply the feedback voltage to the second electrostatic actuator so that the gap between the reflection films (54, 55) detected by the gap detection unit is a target gap amount of the gap between the reflection films (54, 55), characterized in that the bias voltage applying unit is configured to apply bias voltage to the first electrostatic actuator, so that the sensitivity (R c) with respect to the feedback voltage applied to the second electrostatic actuator required so as to change the amount of the gap by a predetermined gap amount is constant at the time of applying feedback voltage to the second electrostatic actuator regardless of the amount of the target gap.