A dryer, comprising: a cabinet; a drum disposed inside the cabinet; a first opening disposed on a front side of the cabinet through which an object to be dried is to be placed in the drum; a second opening disposed on the front side of the cabinet; a heat exchanger disposed inside the cabinet to exchange heat with air and accessible through the second opening; a dehumidification unit (100, 300), accessible through the second opening and attachable to and detachable from the inside of the cabinet through the second opening; and a filter unit; wherein the dehumidification unit (100, 300) includes: an inlet port (121, 301) disposed on a front side of the dehumidification unit to allow air to be introduced through the second opening into the inlet port, a discharge port (111, 311) disposed on a rear side of the dehumidification unit to guide the air, which is introduced through the inlet port into the discharge port, to the heat exchanger, an intake port (112, 312) disposed on a lateral side of the dehumidification unit to allow the air, which is discharged from the drum, to be introduced into the intake port, an outlet port (122, 302) disposed on the front side of the dehumidification unit to allow the air, which is introduced through the intake port into the outlet port, to be discharged through the second opening, and a guide (130, 330) disposed to partition a first flow path (170, 370) extending from the inlet port to the discharge port and a second flow path (180, 380) extending from the intake port to the outlet port, and characterized in that the filter unit is accessible through the second opening, attachable to and detachable from the inside of the cabinet through the second opening, and interchangeable with the dehumidification unit, wherein the filter unit is configured to provide a third flow path for supplying air which is discharged from the drum during a drying operation to the heat exchanger. a cabinet; a drum disposed inside the cabinet; a first opening disposed on a front side of the cabinet through which an object to be dried is to be placed in the drum; a second opening disposed on the front side of the cabinet; a heat exchanger disposed inside the cabinet to exchange heat with air and accessible through the second opening; a dehumidification unit (100, 300), accessible through the second opening and attachable to and detachable from the inside of the cabinet through the second opening; and a filter unit; wherein the dehumidification unit (100, 300) includes: an inlet port (121, 301) disposed on a front side of the dehumidification unit to allow air to be introduced through the second opening into the inlet port, a discharge port (111, 311) disposed on a rear side of the dehumidification unit to guide the air, which is introduced through the inlet port into the discharge port, to the heat exchanger, an intake port (112, 312) disposed on a lateral side of the dehumidification unit to allow the air, which is discharged from the drum, to be introduced into the intake port, an outlet port (122, 302) disposed on the front side of the dehumidification unit to allow the air, which is introduced through the intake port into the outlet port, to be discharged through the second opening, and a guide (130, 330) disposed to partition a first flow path (170, 370) extending from the inlet port to the discharge port and a second flow path (180, 380) extending from the intake port to the outlet port, and characterized in that the filter unit is accessible through the second opening, attachable to and detachable from the inside of the cabinet through the second opening, and interchangeable with the dehumidification unit, wherein the filter unit is configured to provide a third flow path for supplying air which is discharged from the drum during a drying operation to the heat exchanger. an inlet port (121, 301) disposed on a front side of the dehumidification unit to allow air to be introduced through the second opening into the inlet port, a discharge port (111, 311) disposed on a rear side of the dehumidification unit to guide the air, which is introduced through the inlet port into the discharge port, to the heat exchanger, an intake port (112, 312) disposed on a lateral side of the dehumidification unit to allow the air, which is discharged from the drum, to be introduced into the intake port, an outlet port (122, 302) disposed on the front side of the dehumidification unit to allow the air, which is introduced through the intake port into the outlet port, to be discharged through the second opening, and a guide (130, 330) disposed to partition a first flow path (170, 370) extending from the inlet port to the discharge port and a second flow path (180, 380) extending from the intake port to the outlet port, and characterized in that the filter unit is accessible through the second opening, attachable to and detachable from the inside of the cabinet through the second opening, and interchangeable with the dehumidification unit, wherein the filter unit is configured to provide a third flow path for supplying air which is discharged from the drum during a drying operation to the heat exchanger.