PURPOSE: To constitute an electronic circuit package which can be mounted on a shelf to be inserted and drawn out freely by an guide member provided to the shelf to be commonly used by various shelves regardless of variation of thickness of the electronic circuit package main body.

CONSTITUTION: An electronic circuit package is provided with an electronic circuit package main body 10 and adapter members 12, 14 bonded to the electronic circuit package main body 10. When the electronic circuit package is mounted on a shelf to be inserted and drawn out freely, the adapter members 12, 14 are fitted to a guide member 26 provided to the shelf and the electronic circuit package is guided.