An adapter for endoscope 41 includes: an image pickup device driving signal generation circuit an image signal output circuit an endoscope identification information reception circuit receiving endoscope ID information a ROM 41a storing adapter ID information about the adapter 41 a flash memory 41 b storing parameters for adjustment and a control section 91 performing control to store the parameters for adjustment into the flash memory 41b according to a command from a processor 11 to write the parameters for adjustment, and read the parameters for adjustment stored in the flash memory and output the parameters for adjustment stored in the flash memory 41b to the processor 11 according to a command from the processor 11 to read the parameters for adjustment.
