The present invention relates to a pharmaceutical composition for preventing or treating thyroid diseases and a food composition for improving thyroid function, comprising an extract from Lonicera caerulea L. car. Edulis fruits as an active ingredient. The composition of the present invention may be useful for preventing or treating thyroid diseases such as hypothyroidism, hyperthyroidism, thyroid nodule, or thyroditis, and improving thyroid function. Since the extract from Lonicera caerulea L. car. Edulis fruits, which is an active ingredient of the present invention, is derived from natural products, there is no concern for side effects such as toxicity compared to synthetic medicine.
