A parting surface structure of a bulletin device having a device frame, includes and open bearing portion in the device frame, a parting surface body formed as a front face of the device frame, the parting surface body including a pivot for pivotally mounting the parting surface body in the open bearing portion, and an abutment member in the open bearing portion for preventing removal of the pivot, the abutment member being rotatable with the pivot in the open bearing portion, and a bulletin suspending mechanism of a bulletin device having a parting portion which constitutes a front face of a device frame and which is formed for opening and closing motion or removably, a suitable number of retaining means are mounted inside a horizontal mounting portion hidden on a rear side of the parting portion, the retaining means being each mounted with a bolt so as to be adjustable its movement inwards and outwards, and a bulletin is connected to the retaining means and suspended in a tensed state within the device frame by turning the head of each said bolt positioned outside the horizontal mounting portion.