To solve the problems of a fence post, which is currently used for a guard fence against vehicle entrance, fence against trespassing, or the like is placed as a single pillar, that the whole post must be replaced when partially damaged to lose its function, and that the post does not have versatility since its use application is limited.

A number of types of divided guard fence posts are fabricated and prepared as post members of required shapes and lengths, which are then combined and fitted together according to a purpose. This provides a number of types of guard fence posts, thus enables construction of a desired guard fence post.