This invention relates to a direct conversion X-ray sensor and to a method of manufacturing the same. This X-ray sensor includes an array substrate including a pixel electrode formed so as to protrude from a surface thereof at a pixel region; a photoconductive substrate including an upper electrode, and a photoconductive layer formed on a surface of the upper electrode so as to be in contact with the pixel electrode and having a PIN diode structure; and a bonding material filling a space around a contact region of the pixel electrode and the photoconductive layer so as to bond the array substrate and the photoconductive substrate.