In a printhead having a plurality of element substrates, the effects of the rise in element substrate temperature and current noise are not manifested in a biased manner in only one of the element substrates. The printhead includes a plurality of printing elements and is provided with first and second element substrates having the plurality of printing elements and a second element substrate in such a manner that the first element substrate and second element substrate are spaced apart, with the first element substrate having a first function circuit electrically connected to the second element substrate and having processing functions used for driving the printing elements of the second element substrate.