PURPOSE: To improve the operability of an image inputting device by converting the correction value of exposure to the reference value of an automatic exposure means by a reset means.

CONSTITUTION: A camera head outputs image information from a terminal (a) and also gives an average luminance signal to an integration circuit 109 from a terminal (b). The said signal is integrated 109 after weighted with a signal from a terminal (d) and inputted to a controller 112 through an A/D converter 111. A synchronizing signal is transmitted from a terminal (c) to the integration circuit 109 so as to instruct the resetting time of integration waveform and also a pulse is transmitted from the terminal (c) so as to instruct a time for fetching the integration waveform to a controller 112. The controller 112 compares the result of measuring light quantity with a specified threshold and an up 118/down 119 members are operated with the command signal in 'H' level so as to respectively operate a zoom 114/focus 115/diaphragm and a reset switch 120. With such a constitution, the image input device whose operability is excellent can be obtained.