There is provided an OCT probe, comprising: a flexible tube an optical fiber that transmits object light and is supported in the flexible tube to be able to freely rotate about an axis of the optical fiber an objective optical system that is fixed to a tip of the optical fiber and includes a condensing optical system which condenses the object light emerging from the optical fiber, and a deflection optical element which irradiates a subject with the object light by deflecting the condensed object light and a barycenter adjustment member that is fixed to the objective optical system and causes a combined barycenter of the objective optical system and the barycenter adjustment member to be situated on the axis of the optical fiber.
