A bier is a stand on which a corpse, coffin, or casket containing a corpse is placed to lie in state or to be carried to the grave. In Christian burial, the bier is often placed in the center of the nave with candles surrounding it, and remains in place during the funeral. The bier is a flat frame, traditionally wooden but sometimes of other materials. In antiquity, it was often a wooden board on which the dead were placed, covered with a shroud. In modern times, the corpse is rarely carried on the bier without being first placed in a coffin or casket, though the coffin or casket is sometimes kept open. A bier is often draped with cloth to lend dignity to the funeral service. The modern funeral industry uses a collapsible aluminum bier on wheels, known as a "church truck" to move the coffin to and from the church or funeral home for services. Biers are generally smaller than the coffin or casket they support for reasons of appearance. As a result, they are not particularly stable and can tip over unless well-centered and undisturbed.

In summary, a bier is a structure used to hold a coffin during a funeral, and it is often placed in the center of the nave with candles surrounding it during Christian burial.