PURPOSE: To obtain a light-dispersive alarm lamp with a structure backward glare-proofed and increasing in forward light quantity.

CONSTITUTION: An lighting apparatus part comprises a rotary lamp 3 for rotary light projection, a reflection plate 32 for reflection projection around the rotary light projection from the rotary lamp 3, being suitably disposed, and a globe 2 having light transmission for external covering. In this light-dispersive alarm lamp, a glare-proof reflection plate 4 is disposed in between the rotary lamp 3 and the glove 2 for intercepting rotary light projection of the rotary lamp 3 are reflection projection of the reflection plate 32 in specific directions and reflecting them in directions opposite to the specific directions.