A device for measuring the temperature of molten metal irrespective of the nature of the metal, particularly, an immersion/contact type temperature sensing device involving optical fiber which can be universally used for different materials and would be adapted for safe and repetitive immersion in molten metal for measurement of molten metal temperatures and the like. The proposed immersion/contact type temperature sensing device involves combination two-color and multi-color pyrometric detection technique is capable of cost effective and discrete-time temperature measurement of molten metal. The advancement is thus directed to serve as a ready and fast accurate measurement of molten metal temperature and the like.