PROBLEM TO BE SOLVED: To provide a light source device and the like which can prolong a period in which continuous use is possible more than conventional.SOLUTION: A light source device has: a light-emitting element generating laser beam； a light receiving element receiving a part of the laser beam emitted by the light-emitting element, generating, and outputting a light receiving signal equipped with output current in size in accordance with a light amount of the laser beam received； a driving signal supply part which generates a driving signal for driving the light-emitting element and supplies the light-emitting element with it； and a determination part which determines whether or not a failure has occurred to the driving signal supply part on the basis of a first detection amount obtained by detecting one of the size of the driving current in the driving signal and size of forward voltage in the light-emitting element, and determines whether or not deterioration has occurred to the light-emitting element and/or the light receiving element on the basis of a second detection amount obtained by detecting the other of the size of the driving current and the size of the forward voltage and a third detection amount obtained by detecting size of the output current.SELECTED DRAWING: Figure 6【課題】継続使用可能な期間を従来よりも延ばすことが可能な光源装置等を提供する。【解決手段】光源装置は、レーザ光を発生する発光素子と、発光素子から発せられたレーザ光の一部を受光し、受光したレーザ光の光量に応じた大きさの出力電流を具備する受光信号を生成して出力する受光素子と、発光素子を駆動させるための駆動信号を生成して発光素子に供給する駆動信号供給部と、駆動信号における駆動電流の大きさ及び発光素子における順方向電圧の大きさのうちの一方を検出して得られる第１の検出量に基づき、駆動信号供給部における故障の発生の有無を判定するとともに、駆動電流の大きさ及び順方向電圧の大きさのうちの他方を検出して得られる第２の検出量と、出力電流の大きさを検出して得られる第３の検出量と、に基づき、発光素子及び／または受光素子における劣化の発生の有無を判定する判定部と、を有する。【選択図】図６
