The bodhran, a hand-drum called by that name and no other and made specifically to be a musical instrument, and for no other purpose, was invented in the 1930s. It derives, as others have noted, from earlier use of winnowing trays as improvised drums.

See David G. Such, "The Bodhran: The Black Sheep in the Family of Traditional Irish Musical Instruments", Galpin Society Journal, Vol. 38, page 9 (1985).