PROBLEM TO BE SOLVED: To hold a sheet easily and strongly when the sheet is stretched for a vinyl greenhouse.SOLUTION: A device includes a sheet-holding bar 3 which has: an opening portion 33, which is narrower than a band-like bottom wall portion 30, formed from the bottom wall portion 30, and a first side wall portion 31 and a second side wall portion 32 each standing from both sides of the longitudinal-side end portion of the bottom wall portion 30； and a groove portion 34 in which a part of the sheet is inserted, and a sheet holder 4 which includes: a belt plate-like bottom plate portion 41 capable of being arranged inside the groove portion 34 of the sheet-holding bar 3 and of which the back surface abuts against the sheet； a first side plate portion 42 and a second side plate portion 43 each extending obliquely upward and inward from both sides of the longitudinal-side end portion of the bottom plate portion 41, and engaging the inside of the first side wall portion 31 and the second side wall portion 32 of the sheet-holding bar 3； and an engaging portion 44 which extends outward from the upper end portion of the second side plate portion 43 and engages the upper end portion of the second side wall portion 32 of the sheet-holding bar 3.【課題】ビニールハウスのシート材を張設する際、シート材を容易かつ強固に固定する。【解決手段】帯状の底壁部３０と、この底壁部３０の長手側端部の両側にそれぞれ立設された第１側壁部３１および第２側壁部３２とによって、底壁部３０よりも幅狭の開口部３３が形成され、シート材の一部を挿入させる溝部３４を有するシート材留め条材３と、シート材留め条材３の溝部３４内に配置可能であり、シート材に裏面が当接する帯板状の底板部４１と、この底板部４１の長手側端部の両側にそれぞれ内側に向けて斜め上方に延設された第１側板部４２および第２側板部４３であり、シート材留め条材３の第１側壁部３１および第２側壁部３２の内側にそれぞれ係合する第１側板部４２および第２側板部４３と、この第２側板部４３の上端部から外側に向けて延設され、シート材留め条材３の第２側壁部３２の上端部に係合する係合部４４とを有するシート材留め具４とを含む。【選択図】図６
