A bending apparatus for corrugating a sheet-like material can comprise a support member, a feed mechanism, a bending member, a hold-down member, and a driving mechanism. The support member can comprise a support surface formed with desired corrugations. The feed mechanism can be configured to feed the support member in increments corresponding to one pitch of the corrugations formed on the support member. The bending member can be configured to be reciprocated between an actuated position mating with a corrugation on the support surface such that a sheet-like material laying on the support surface is bent along the corrugation formed on the support member and a retracted position. The hold-down member can be configured to be reciprocated between an actuated position holding the sheet-like material against the support surface and a retracted position. The drive mechanism can be configured to sequentially reciprocate the bending member and the hold-down member so that the hold-down member presses down the sheet-like material and the bending member bends the sheet-like material.