An operation-testing device for infrared spot type flame detector. The testing device is capable of providing 2 ranges of emission of spectrums that are required to operate infrared flame detector: the spectrum similar to CO2 spikes immersion region by using an infrared filters over a source and the flickering similar to a flame by using a flashing lamp. Available two type of testing methods depends upon the testing site environments. (a) Using the Test Initiation Switch (Normally use in this method), or (b) Using the Manual Test Switch (use this method if the (a) is not possible). This testing device is mandated to calibrate at every 10 years. The testing rod (Total length : 3,990 mm) is sold separately.