The subject of the present invention is to provide a catheter, a guide wire, a hole position specifying device, a hole position specifying method, a judgment support device for the presence or absence of an object in the body, and a diagnosis support that can easily specify the position of the hole of the catheter in the body Device and treatment support device.The guide wire 20 of the present invention is a guide wire inserted into a catheter 30. The catheter 30 has a hole for putting a fluid substance into the body or for attracting the fluid substance in the body. In addition, one or more light sources 10 for specifying the position of the hole 32 of the catheter 30 are provided. The catheter 30 can also be provided with one or more light sources 10 for specifying the position of the hole 32 of the catheter 30.本發明之課題在於提供一種能容易地對位於體內之導管之孔之位置進行特定的導管、導引線材、孔位置特定裝置、孔位置特定方法、在體內之物體存否的判斷支援裝置、診斷支援裝置及治療支援裝置。本發明的導引線材20係插入至導管30的導引線材，該導管30具有孔，該孔係用以將流動性物質投入至體內或用以吸引體內之流動性物質。並且，設置有一或複數個用以特定導管30之孔32之位置的光源10。導管30也可設置有一或複數個用以特定導管30之孔32之位置的光源10。
