PROBLEM TO BE SOLVED: To provide a seedling box washer which can improve workability of seedling box washing and economical efficiency without preparing two kinds of washers including a washer dedicated for a seedling box for a paddy rice and a washer dedicated for a seedling box for a vegetable.SOLUTION: A seedling box washer comprises: a transportation mechanism A which selects and horizontally transports both of seedling boxes including a box-tray shaped seedling box for a paddy rice where a rising wall part is formed at a peripheral edge part of a rectangular plate-like bottom plate part and a cell-tray shaped seedling box for a vegetable where a plurality of recessed pot parts are formed and arranged in lengthwise and breadthwise directions at the rectangular plate-like bottom plate part and a water jet washing mechanism B which washes both of the seedling boxes in the middle of transportation of the seedling boxes.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】水稲用育苗箱専用の洗浄機及び野菜用育苗箱専用の洗浄機の二種類の洗浄機を用意することがなくなり、育苗箱洗浄の作業性を向上することができ、経済性を向上することができる育苗箱洗浄機を提供する。【解決手段】四角板状の底板部の周囲縁部に立上壁部が形成された箱トレイ状の水稲用育苗箱又は四角板状の基板部に複数個の凹部状のポット部が縦横に配列形成されたセルトレイ状の野菜用育苗箱の両育苗箱を選択して水平搬送する搬送機構Aと、両育苗箱の搬送経路途中に両育苗箱を洗浄する噴射水洗浄機構Bとを備えてなる。【選択図】図1