PROBLEM TO BE SOLVED: To provide a protector and a radiation imaging system which prevent damage to an electronic cassette and improve efficiency of preparation work for imaging.SOLUTION: The protector 22 for protecting the electronic cassette 20 which has a control section 34 and a panel part 32, includes: a casing 200 and a plurality of slots 204 which are provided inside the casing 200 and through which a plurality of panel parts 32 of the electronic cassette 20 are inserted and which holds the inserted panel parts 32 in parallel to an imaging surface 206 of the casing 200.COPYRIGHT: (C)2012,JPO&INPIT【課題】電子カセッテの損傷を防止するともに、撮像のための準備作業の効率を向上させる保護具、及び放射線撮像システムを提供する。【解決手段】制御部34とパネル部32とを有する電子カセッテ20を保護する保護具22は、筐体200と、複数の電子カセッテ20のパネル部32が挿入可能であり、該挿入されたパネル部32を筐体200の撮像面206に対して平行に保持する筐体200の内部に設けられた複数のスロット204とを備える。【選択図】図5