The affixation is an important part of the word construction process and must be considered in the morphological aspect of word production. In general, there are two types of affixation processes: derivational and inflectional. This study focused on the types of derivational affixes found in the novel Before the Coffee Gets Cold and their functions. The information was gathered by marking/quoting the novel’s sentences according to their forms and functions. The main theory used in this research is Francis Katamba’s theory of derivational morpheme found in Morphology (1993). An Introduction to Language by Victorian Fromkin, Robert Redman, Peter Collins, and David Blair (1985) and English Word Formation by Laurie Bauer were used as supporting theories (1983). According to the findings of the analysis, the novel Before the Coffee Gets Cold contains some forms and functions of derivational affixes. Prefix en-, which can change the word class and meaning of base, and prefix un-, re-, in-/ im-, and dis-, which can modify the meaning of the base without changing the word class, are examples of derivational affixes found in data sources. Aside from the prefix, there are suffixes like -al, -ing, -en, -less, -able, -ful, -ion, -ness, -er, and -ize that can change the word class and meaning of the base, as well as suffixes like -ship, - or -ful, and -er that can change the meaning of the base without changing the word class.
Keywords: derivational affixes, morphology, novel “Before the Coffee Gets Cold by Toshikazu Kawaguchi