A wireless endoscope includes: a detection portion configured to detect a connection state to an endoscope body of a battery; and a control portion configured to set a replacement time operation mode of using the power from a 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 an 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, in which the control portion restores the normal time operation mode from the replacement time operation mode when a detection result of a reconnection state to the endoscope body of the battery is given from the detection portion.