José Isbert is a widower and disregarded by his family. He has his friends, all of whom have wheelchairs of various sorts, and Isbert can't keep up with them. He takes it into his head that he wants a wheelchair himself, and not just any wheelchair, but a motorized one that will let him get around easily.
It has two stories to tell: one is the lack of regard people hold their elders in, and that is heartrending. The other is Isbert's child-like and childish insistence on getting his own way no matter the consequences. Isbert's performance is very real, and very telling, but the two stories are in conflict; to sympathize with him is to make the social commentary telling, but Isbert's performance reduces that impact; and so the performance of Pedro Porcel as his son and financial mainstay of the family remains emotionally uncaring but practical.