A wireless endoscope includes: an image pickup portion configured to pick up an image of an object； a power storage component configured to hold power； a detection portion configured to detect a connection state to an endoscope body incorporating the image pickup portion and the power storage component of a battery attachably and detachably attached to the endoscope body, the battery being configured to generate power needed for endoscopic observation； and a control portion configured to set a replacement time operation mode of using the power from the power storage component as the power needed for the endoscopic observation and performing the endoscopic observation with lower power compared to a normal time operation mode of performing the endoscopic observation with the power from the battery, when a detection result of a non-connection state of the battery is given from the detection portion.
