A tire testing method includes: a step for applying a lubrication solution to a bead part of a tire; a step for detecting a phase of a reference point of the tire; a step for detecting a phase of a rotation origin of a spindle at common coordinates shared with coordinates at which the phase of the reference point is indicated; a step for detecting a singular point present on the tire by conducting a tire test while rotating the tire on the spindle, and detecting a phase from the rotation origin to the singular point; a step for calculating a phase from the reference point to the singular point based on the phase of the reference point, the phase of the rotation origin, and the phase from the rotation origin to the singular point; a step for storing information about the reference point at the common coordinates and information about the rotation origin at the common coordinates; and a step for marking the tire at a position along a circumferential direction where the singular point is present.