A second portion of a writing device is caused to penetrate a through-hole of a tubular portion of a pen pressure transmitter, starting from a first end of the second portion of the writing device, and the tubular portion abuts a surface of a first portion of the writing device that faces the second portion of the writing device. When a pen pressure is exerted on the first portion of the writing device, the pen pressure also is exerted on the tubular portion of the pen pressure transmitter abutting the surface of the first portion of the writing device that faces the second portion of the writing device. The pen pressure is transmitted through the pen pressure transmitter to a pen pressure detector disposed at a position spaced apart from the writing device.