PROBLEM TO BE SOLVED: To provide a quality control phantom for adjusting an irradiation position and an irradiation direction of a line laser by a line laser sight with higher accuracy. A quality control phantom 7 is used for quality control of a radiation treatment system 1 having a line laser aiming device 5, and is a near side determination unit (for example, 74) having a near side reference index (for example, 74) as an adjustment reference index. A far side determination unit (for example, a part of 50B) having a far side reference index (for example, 75) as an adjustment reference index (a part of 50A), and a far side determination unit side from the near side determination unit side. As you can see, the near-side reference index and the far-side reference index overlap the virtual reference axis, and the near-side judgment part side to the far-side judgment part side are set to any angle direction within the maximum spread angle direction range of the line laser. As seen, a part of the far-side reference index is configured so as not to overlap the light-shielding region of the near-side determination unit. [Selection diagram] Fig. 2【課題】ラインレーザ照準器によるラインレーザの照射位置及び照射向きをさらに高精度で調整するための品質管理用ファントムを提供する。【解決手段】品質管理用ファントム７は、ラインレーザ照準器５を有する放射線治療システム１の品質管理に用いられ、調整基準指標としての近側基準指標（例えば７４）を有する近側判定部（例えば５０Ａの一部）と、調整基準指標としての遠側基準指標（例えば７５）を有する遠側判定部（例えば５０Ｂの一部）と、を備え、近側判定部側から遠側判定部側を見て、近側基準指標と遠側基準指標とが仮想の基準軸線に重なるとともに、近側判定部側から遠側判定部側をラインレーザの最大広がり角度方向範囲内のいずれかの角度方向に見て、遠側基準指標の一部が近側判定部の遮光領域に重ならないよう構成される。【選択図】図２
