A support jig is configured to be capable of supporting a first anti-vibration material including a first outer cylinder and a second anti-vibration material including a second outer cylinder, the support jig including a jig main body that accommodates lower portions of the first and second anti-vibration materials, and an adapter configured to be selectively attachable onto an upper portion of the jig main body. The jig main body includes, at an upper end portion, a main body counterbore portion for supporting the first anti-vibration material from below while horizontally positioning the first anti-vibration material at the first outer cylinder, in a state where no adapter is attached. The adapter includes, at an upper end portion, an adapter counterbore portion for supporting the second anti-vibration material from below while horizontally positioning the second anti-vibration material at the second outer cylinder, in a state where the adapter is attached.