To normally operate an article positioned in front of a push rod even if the front part of the push rod moving forwardly and rearwardly in cooperation with a knock button is flat or odd-shaped, in the knock structure of stationery or the like.

The knock structure of the stationery or the like is equipped with a knock mechanism constituted of the knock button, a knock spring or the like for allowing the push rod to advance and retreat. The front part of the push rod is made odd-shaped or flat in its cross section at a position of the axis of the push rod or a position eccentric with respect to the axis and the line end part of the front end of the knock spring attached to the outer periphery of the push rod is bent and the front part of the push rod can be fitted and inserted in a guide part formed to the bent part without being shaken.