To resolve problems in management of chemicals needing bar codes to be pasted on all chemicals, requiring much time and labor, and having difficulty in introduction of a chemical inventory management system or a chemical distribution management system.

Master information such as shape and weight of a chemical is recorded so it can be electronically read in the exclusive tray for setting the chemical. By using an exclusive reader, detecting the quantity of chemicals on the basis of the information recorded in the exclusive tray and information of various sensors provided on the reader, and sending it to each system, labor and time of pasting bar codes or the like on all chemicals can be eliminated and a system with little operation load can be constructed.