The inventive concept provides a substrate treating apparatus. The substrate treating apparatus includes a treating bath having an accommodation space for accommodating a treating liquid; a support member configured to support at least one substrate in a vertical posture at the accommodation space; and a posture changing robot configured to change a posture of a substrate immersed in the treating liquid from the vertical posture to a horizontal posture, and wherein the posture changing robot comprises: a body configured to hold the substrate thereon; and a liquid supply member configured to supply a wetting liquid to the substrate placed on the body.