To obtain intended diffraction light characteristic.SOLUTION: A movable diffraction grating 10 pertaining to the present invention comprises: a movable grating coupling unit 11 for bundling a plurality of movable gratings 110 in a shape of a sinking comb; an actuator unit 12 for driving the movable gratings; a plurality of stationary gratings 140 located between each of the movable gratings; and a stationary grating coupling unit 14 for bundling the plurality of stationary gratings. The movable diffraction grating 10 also includes at least one of a movable grating connection unit 13 provided between the movable grating coupling unit 11 and the actuator unit 12 and functioning to tilt the movable grating coupling unit 11 so that an angle formed by a tip 110A of the movable grating and the horizontal plane is larger than 0 and smaller than a deflection angle θ of a tip 110a of the movable grating, and a stationary grating connection unit 16 provided between the stationary grating coupling unit 14 and a support unit 15 and functioning to tilt the stationary grating coupling unit 14 so that an angle formed by a tip 140a of the stationary grating and the horizontal plane is larger than 0 and smaller than a deflection angle of the tip 140a of the stationary grating.SELECTED DRAWING: Figure 1
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