According to a patient bed system including a defecation device having an improved piping structure, presented in the present invention, a defecation device is integrally provided in a patient bed, an excrement discharge pipe communicating with a discharge hole at the lower part of a bedpan body is formed by a roundedly inclined piping structure in which excrement flows down by its own weight, an opened end of the excrement discharge pipe can be opened and closed in order to discharge excrement by means of the simple operation of a handle part including an opening and closing member, and an excrement collection polybag in which excrement collection plastic is embedded so as to be discharged in order to facilitate the collection of excrement discharged by a patient is formed so as to be fastened to the excrement discharge pipe, such that, compared with a conventional excrement device, the present invention facilitates cleaning and can increase the convenience of simple operation with one hand.
