The present invention provides a dehumidifier, including a main body, comprising a dehumidification passage in which indoor air is sucked in and the sucked-in indoor air is dehumidified and a reconditioning passage in which reconditioning air circulates, a dehumidification rotor, comprising a dehumidification portion configured to dehumidify the indoor air and a reconditioning portion reconditioned using the reconditioning air, and a condensing heat exchanger, comprising reconditioning air introduction units into which the reconditioning air is introduced and reconditioning air discharge units from which the reconditioning air is discharged. Each of the reconditioning air introduction units of the condensing heat exchanger has a width which, at a position opposite to the reconditioning portion, increases according to a distance from a center of the condensing heat exchanger corresponding to a center of the dehumidification rotor. The reconditioning air discharge units are formed on one side of a circumferential portion of the condensing heat exchanger. Accordingly, the dehumidification performance of the dehumidifier can be improved and noise caused when the dehumidifier is driven can be reduced.