A tuning fork gyro sensor includes a tuning fork vibrator and a casing. The tuning fork vibrator includes a pair of arms that extend parallel, a base that supports the pair of arms, and supporting members that are arranged on both faces of the base such that the supporting members are positioned at the equal distances from both the pair of arms, and that project from the both faces of the base, the both faces being perpendicular to both a direction in which the pair of arms extend and a direction in which the pair of arms are aligned. The casing is hollow to house and support the tuning fork vibrator by supporting the supporting members.