Provided are a control system and an authentication device capable of detecting abnormality of a development device for distributing a control program and of preventing destruction and tampering of the program caused by the abnormality. To solve the above problem, there is provided: a control device that controls a controlled object; a development device that manages a plurality of control programs executed by the control device and sends the predetermined control program and information accompanying the control program to the network; and an authentication device having an authentication list storing the information accompanying the control program in association with the control program. Upon receiving the control program and the information accompanying the control program from the development device, the authentication device performs authentication whether or not the development device is normal by checking the accompanying information received from the development device with the information stored in the authentication list.