To provide a compact stabilizer control device capable of smoothly and certainly connecting/disconnecting a pair of stabilizers.

A first stabilizer bar 11 and a second stabilizer bar 12 are coaxially and approachingly arranged, and a drive means DR and a rotation linear advancement motion conversion mechanism TM are coaxially arranged. It is arranged such that an engagement/disengagement member 40 is moved in an axial direction according to rotation drive of the same mechanism, and a connection position where a second outer spline part 42 is engaged with a second inner spline part 32 and a release position for releasing engagement of both members are switched while maintaining the engagement state of a first inner spline part 21 and a first outer spline part 41 according to the axial movement. It may be formed such that tooth thickness of at least one spline of the first and second outer spline parts is varied in a lead direction.