< Topic >The bacteriums bed cultivation shelf of the mushroom the increase floor device of the bacteriums bed cultivation shelf where become easily expansion and reduction possible on the track/truck aisle inside the house is offered.SolutionsAs a) you avoid between the track/truck aisle R inattention inside house H, in order the destal is made to face to the vicinity of track/truck aisle R on the one hand, other edge side shelf frame 1 of the multiple steps which were formed long in orthogonal direction vis-a-vis track/truck aisle R direction and b) on the horizontal frame which supports the shelf surface of each step of shelf frame 1 from under the bacteriums bed K is locked parallel at the width which becomes mount possible, at the same time at least for Tip 2of a track/truck aisle R side of each step not to go into track/truck aisle R, the multiple metal flexible pipes 2 which are arranged and, inside diameter of c) metal flexible pipe 2It possesses a smaller major diameter, the bacteriums bed K the mount 1 or more has the length which is possible, inside each metal flexible pipe 2 consists of with extended body 3 of the flexible pipe condition which is made frequent appearance possible.< Choice figure >Drawing 1【課題】キノコの菌床栽培棚をハウス内のトラック通路上に容易に拡張及び縮小が可能と成る菌床栽培棚の増床装置を提供する。【解決手段】a)ハウスH内のトラック通路R上の空間を避けると共に、トラック通路Rの近傍に一方端部を臨ませ、他方端側をトラック通路R方向に対して直交方向に長く形成した複数段の棚フレーム1と、b)棚フレーム1の各段の棚面を下から支える水平フレーム上に菌床Kが載置可能となる幅で平行に固定され、且つ各段の少なくともトラック通路R側の先端部2aがトラック通路R内に入らないように揃えられた複数の金属パイプ2と、c)金属パイプ2の内径よりも小さい外径を有し、菌床Kが1個以上載置可能な長さを有し、各金属パイプ2内を出没可能とするパイプ状の拡張体3とから成る。【選択図】図1