A laundry dryer comprising: a rotary drum configured to accommodate laundry; a steam unit configured to supply steam into the rotary drum; a tank configured to store water to be supplied to the steam unit; a water supply port configured to supply the water to the tank; a display unit configured to allow a user to select an operation, said operation being an operation which does not use steam or an operation which uses steam; a water detection unit configured to detect the water inside the tank; a first notification unit configured to perform a first notification prompting a user to supply water to the tank; characterized in that: the tank comprises a water storage unit and a hose joint, said hose joint connecting the water storage unit and the steam unit via a water supply pipe; the water detection unit is configured to detect whether or not the water inside the water storage unit reaches a predetermined water level and output a signal relating to a detected state of the water level to a controller; the laundry dryer further comprising: the controller that is configured to cause the first notification unit to perform the first notification based on the signal transmitted from the water detection unit, if an operation is selected which uses steam and if the signal indicates that the water level does not reach a predetermined water level, said first notification being performed during a period from power supply until the water inside the water storage unit reaches the predetermined water level, and stop said first notification when the water inside the water storage unit reaches the predetermined water level, and start the operation at a predetermined time, a time duration from a time when the power supply is started to the predetermined time being equal to or longer than said period; wherein the water detection unit is disposed inside the hose joint and comprises a float switch. a rotary drum configured to accommodate laundry; a steam unit configured to supply steam into the rotary drum; a tank configured to store water to be supplied to the steam unit; a water supply port configured to supply the water to the tank; a display unit configured to allow a user to select an operation, said operation being an operation which does not use steam or an operation which uses steam; a water detection unit configured to detect the water inside the tank; a first notification unit configured to perform a first notification prompting a user to supply water to the tank; characterized in that: the tank comprises a water storage unit and a hose joint, said hose joint connecting the water storage unit and the steam unit via a water supply pipe; the water detection unit is configured to detect whether or not the water inside the water storage unit reaches a predetermined water level and output a signal relating to a detected state of the water level to a controller; the tank comprises a water storage unit and a hose joint, said hose joint connecting the water storage unit and the steam unit via a water supply pipe; the water detection unit is configured to detect whether or not the water inside the water storage unit reaches a predetermined water level and output a signal relating to a detected state of the water level to a controller; the laundry dryer further comprising: the controller that is configured to cause the first notification unit to perform the first notification based on the signal transmitted from the water detection unit, if an operation is selected which uses steam and if the signal indicates that the water level does not reach a predetermined water level, said first notification being performed during a period from power supply until the water inside the water storage unit reaches the predetermined water level, and stop said first notification when the water inside the water storage unit reaches the predetermined water level, and start the operation at a predetermined time, a time duration from a time when the power supply is started to the predetermined time being equal to or longer than said period; wherein the water detection unit is disposed inside the hose joint and comprises a float switch. the controller that is configured to cause the first notification unit to perform the first notification based on the signal transmitted from the water detection unit, if an operation is selected which uses steam and if the signal indicates that the water level does not reach a predetermined water level, said first notification being performed during a period from power supply until the water inside the water storage unit reaches the predetermined water level, and stop said first notification when the water inside the water storage unit reaches the predetermined water level, and start the operation at a predetermined time, a time duration from a time when the power supply is started to the predetermined time being equal to or longer than said period; wherein the water detection unit is disposed inside the hose joint and comprises a float switch.