After presenting some basic genetic, historical and typological information about Japanese this chapter outlines the quantification patterns it expresses. It illustrates various semantic types of quantifiers, such as generalized existential, generalized universal, proportional, definited and partitive which are defined in the Quantifier Questionnaire in Chapter 1. It partitions the expression of the semantic types into morpho-syntactic classes: Adverbial type quantifiers and Nominal (or Determiner) type quantifiers. For the various semantic and morpho-syntactic types of quantifiers it also distinguishes syntactically simple and syntactically complex quantifiers, as well as issues of distributivity and scope interaction, classifiers and measure expressions, and existential constructions. The chapter describes structural properties of determiners and quantified noun phrases in Japanese, both in terms of internal structure (morphological or syntactic) and distribution.