To provide a work instruction preparing device and a work instruction preparing system for reducing the labor of work instruction preparation and the labor of each kind of managing work by automatically operating the preparation of a work instruction and the issue management of an acceptance number and a work instruction number.

A work instruction preparing terminal 3 for preliminarily holding the detailed data of work contents in a table 33 is allowed to store a master file corresponding to each work request, and the work instruction preparing terminal 3 prepares a work instruction based on the master file whose work start date is pertinent to that day. Also, the work instruction preparing terminal 3 stores issued acceptance number and work instruction number in an acceptance number management table 34 and an instruction number management table 35, and a serial number assigning part 36 issues the acceptance number and the work instruction number based on each number stored in each management table.