This light emitting electrochemical element is a laminate wherein a first electrode, a light emitting layer that contains a conductive polymer, an electrolyte, a supporting salt and a nitrogen-containing conjugated compound, and a second electrode are sequentially laminated in this order. By applying a voltage between the first electrode and the second electrode, the conductive polymer emits blue light and an exciplex is formed between the conductive polymer and the nitrogen-containing conjugated compound, thereby producing exciplex fluorescence. Consequently, white light is emitted by means of the blue light emission and the exciplex light emission. Meanwhile, this light emitting device comprises a light emitting electrochemical element and a voltage unit that applies a voltage between a first electrode and a second electrode of the light emitting electrochemical element. This light emitting electrochemical element enables light emission infinitely close to white light emission even though the element structure thereof is composed of layers having simple configurations.