The present invention detects coordinates of a designated point and includes a vibration transmission plate having anisotropic properties such that vibrations from a vibration generation source applied to the vibration transmission plate propagate through the vibration transmission plate with differing vibration transmission velocities depending on a direction of transmission of vibration. A plurality of vibration detection units are provided for detecting vibrations transmitted through the vibration transmission plate, and a determination unit determines coordinates of the vibration generation source by measuring time periods of propagation of vibrations through the vibration transmission plate from the vibration generation source to one or more of the vibration detetion units. Further, the vibration transmission plate and the plurality of vibration detection units are provided such that bisectors of angles made by two line segments each connecting two opposing vibration detection units from among the plurality of vibration detection units coincide with axes of anisotropy of the vibration transmission plate.