A line-pattern formation apparatus includes: a pattern former with a display defining a pattern and a referential projection indicating a reference position of the pattern; a positioning plate including a line-pattern indicator indicating a plurality of patterns in a lateral condition and a reference-positioning indicator specifying the reference position of the patterns; and a positioner including a stand on which a sheet is placed and a fixing member for fixing the sheet placed on the stand. The fixing member is provided with fitting portions for making the positioning plate detachably attached to the fixing member.