According to an aspect of the present invention, there is provided a laser
diode array including: a laser array chip including: a substrate; and at
least three of laser diodes that are formed on the substrate; first
electrodes that are formed on each of the laser diodes so as to be
isolated from one another; a sub-mount; and second electrodes that are
formed on the sub-mount so as to correspond to the first electrodes and
so as to be isolated from one another, wherein the laser array chip is
mounted on the sub-mount through the first electrodes and the second
electrodes, and wherein, among contacting surfaces between each of the
first electrodes and a corresponding one of the second electrodes, a
contacting area of a central one of the contacting surfaces is larger
than that of an end one of the contacting surfaces.