The present invention relates to air conditioners. More specifically, the present invention relates to an air conditioner in which a front panel, moving backward and forward closely and smoothly, opens/closes a plurality of air suction openings, to discharge conditioned air upward /downward, for securing an adequate air flow rate to be heat exchanged, making convenient opening/closing control of a flow passage according to various modes, and enabling convenient securing of a driving motor.;For this, the present invention provides an air conditioner including a driving source unit mounted in a case for generating driving force, a front panel movably mounted in front of the case for opening/closing an air suction opening, a power transmission unit for transmission of the driving force from the driving source unit to the front panel, and the power transmission unit having a body portion moving together with the front panel and a guide portion for supporting the body portion.
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