Provided is an improved bidirectional heating cooker having a cooking pan including a first pan portion whose one portion is cut out open in order to form an incision portion and a second pan portion that is placed at the incision portion of the first pan portion, in a manner that the cooking pan is not formed into a fitting method being fitted with a central supporting pillar through a center hole formed at the center of the cooking pan but formed into a seating method being seated on the upper portion of a lower heating unit, to thereby enable the cooking pan to be easily attached on or detached from the lower heating unit to thus be easily washed, and to thereby allow various types of cooking pans to be easily combined to thus enhance conveniences of use and to be easily replaced with new ones and to be easily combined with other types of cooking pans to thus enable the various types of cooking pans to be used in combination and to accordingly cook different kinds of foods simultaneously.