To provide a light-emitting element illumination lamp device capable of improving safety and reliability by preventing influence on a main light source and a peripheral circuit by turning off the main light source when an error is detected in the main light source, and also capable of improving convenience for users and maintenance workers.

A light-emitting element illumination lamp device 1 comprises: a main light source unit 20 which is turned on upon receiving electric power from a first power supply unit 10; a second power supply unit 30 which is connected to an AC power supply 2 to configure a standby power supply differently from the first power supply unit 10; a sub-light source unit 40 which is turned on upon receiving electric power from the second power supply unit 30; and a main control unit 50 which performs the entire control. The main light source unit 20 comprises: a main light source 21 having a light-emitting element LED; a first constant current control unit 23 which drives the main light source 21 with constant current; and a main light source error detection unit 25 which detects an error in the main light source 21. The sub-light source unit 40 includes a sub-light source 41 (sub-light-emitting element SLED) and a second constant current control unit 43 which drives the sub-light source 41 with constant current.