To provide a fan holder structure simply formed, compatible to various types, and easily solving problems in noise, air quantity, and heat.

Rectangular parallelepiped mounting parts 1b for mounting a fan plate 2 with a predetermined air hole allowing the air from a fan to pass therethrough are projectedly installed on both front end inner sides of a fan holder 1. The fan plate 2 can be fitted between the mounting part 1b and the fan holder 1 body side from the upper side as shown by the arrow. With this constitution, the fan plate 2 can be attached to and detached from the fan holder 1 and replaced.