Mass spectrometry (MS) is a method that can perform qualitative and quantitative analyses of polymers and additives contained in polymeric materials by ionizing them and analyzing their molecular masses. There are multiple ionization methods, mass spectrometer types, and data analysis technologies, and it is possible to obtain more comprehensive information by combining them. In this guidebook, we will introduce polymeric materials analysis solutions that make full use of JEOL's high-performance mass spectrometers.