A position adjustment device for a flat panel detector comprising: a guide that is provided on a surface side of the flat panel detector and can be measured by an optical device； and a fixing member configured to fix the guide to one of a side of the flat panel detector of a position adjustment unit and a side of a support portion for supporting the flat panel detector, the position adjustment unit being provided between the flat panel detector and the support portion.[課題] 提供可以提高平板型檢測器的位置調整的作業效率的平板型檢測器的位置調整技術。 [技術內容] 平板型檢測器(13)的位置調整裝置(26)，是具備：設於平板型檢測器(13)的表面側可映在X線畫像並且由光學機器(7)測量的導引部(27)、及將導引部(27)固定在被設於平板型檢測器(13)及其支撐部(18)之間的位置調整部(21)的平板型檢測器側或是支撐部側的其中任一方的固定部(28)。
