A sensing device, comprising: a first unit (101; 701) which includes a sensing module, a battery (150; 742) and a connector (160; 770) to charge the battery (150; 742)); and a second unit (102; 702) to which the first unit (101; 701) is detachably coupled, wherein the connector (160; 770) is accommodated in the second unit (102; 702) in order to block external exposure, in a state where the first unit (101; 701) is coupled to the second unit (102; 702), wherein the sensing module includes: an acceleration sensor, a proximity sensor (123, 753) having a light emitting portion and a light receiving portion, a communication module (130, 743) which is capable of receiving information detected at the sensing module and includes a processor and a memory, the battery (150, 742) supplies power to the processor, characterized in that in a case where the sensing device is attached to a washing apparatus, the processor is configured to detect spin-drying completion of the washing apparatus using the acceleration sensor and sends a washing end notification to an external device when vibration is not detected until reference time lapses, and when the processor determines that door opening of the washing apparatus is not detected before notification reference time lapses after sending of the washing end notification, laundry collection notification information is sent to the external device. a first unit (101; 701) which includes a sensing module, a battery (150; 742) and a connector (160; 770) to charge the battery (150; 742)); and a second unit (102; 702) to which the first unit (101; 701) is detachably coupled, wherein the connector (160; 770) is accommodated in the second unit (102; 702) in order to block external exposure, in a state where the first unit (101; 701) is coupled to the second unit (102; 702), wherein the sensing module includes: an acceleration sensor, a proximity sensor (123, 753) having a light emitting portion and a light receiving portion, a communication module (130, 743) which is capable of receiving information detected at the sensing module and includes a processor and a memory, the battery (150, 742) supplies power to the processor, characterized in that in a case where the sensing device is attached to a washing apparatus, the processor is configured to detect spin-drying completion of the washing apparatus using the acceleration sensor and sends a washing end notification to an external device when vibration is not detected until reference time lapses, and when the processor determines that door opening of the washing apparatus is not detected before notification reference time lapses after sending of the washing end notification, laundry collection notification information is sent to the external device. an acceleration sensor, a proximity sensor (123, 753) having a light emitting portion and a light receiving portion, a communication module (130, 743) which is capable of receiving information detected at the sensing module and includes a processor and a memory, the battery (150, 742) supplies power to the processor, characterized in that in a case where the sensing device is attached to a washing apparatus, the processor is configured to detect spin-drying completion of the washing apparatus using the acceleration sensor and sends a washing end notification to an external device when vibration is not detected until reference time lapses, and when the processor determines that door opening of the washing apparatus is not detected before notification reference time lapses after sending of the washing end notification, laundry collection notification information is sent to the external device.