PROBLEM TO BE SOLVED: To provide a plant cultivation bed structure comparatively simple in structure, obtained at a low cost, and facilitating mounting of arch rods for supporting a thermal insulation sheet.SOLUTION: A plant cultivation bed structure includes: a cultivation bed body 1； support frames 4 having support pipes 5； a plurality of arch receiving devices 7 made of an elastic synthetic resin and mounted to each support pipe； and arch rods 8 made of an elastic synthetic resin and supported at both ends thereof in an upward curved state by the arch receiving devices 7. The arch receiving device 7 includes: a cylindrical part 9 opened upward to receive the tip part of the arch rod 8； a band part 10 radially extended from the cylindrical part and having an engaging tooth row 10a on one surface to fasten the support pipe 5 when mounted； and a fastening head part 11. The head part 11 has an opening 11a for inserting the tip side of the band part 10 therethrough, and a rachet claw 11b engaged in a ratchet form with the engaging tooth row of the band part 10 to prevent the band part 10 from slipping out of the opening 11a.
