The code generation apparatus includes: a clock generation unit (160) which generates a clock signal of a first frequency; a timing control unit (130) which generates a timing signal of a second frequency lower than the first frequency; a code table storage unit (120) in which a plurality of code sequences serving as a source for a pseudo-noise code is stored; an address control unit (110) which selects, according to the timing signal, a code sequence to be read, from among a plurality of code sequences; a partial code sequence extraction unit (140) which extracts, as a partial code sequence, a code of a predetermined length, from the code sequence to be read; and a parallel-series conversion unit (150) which outputs the partial code sequence by one bit at a time, according to the clock signal.