Working range diagram-display apparatus

Provided is a working range diagram and a working range diagram-display apparatus with which a working range can be easily grasped. The working range diagram shows a working range in which a boom (130) of a working machine (100) having the boom (130) can safely move with a three-dimensional spatial coordinate system. In the working range diagram, a part of or all of forward performance, backward performance, right sideward performance and left sideward performance in the working range is shown in different display formats. Since the working range is shown three-dimensionally and the frontward performance, the backward performance, the right sideward performance and the left sideward performance can be distinguished from each other, the working range can be easily grasped. Consequently, a mistake in a work plan is hardly made due to a subjective impression or a misunderstanding, thereby preventing rework or the like.