A storage container (100, 400) configured to accommodate a medical instrument including a catheter member provided with a catheter main body, a catheter hub disposed at an proximal portion of the catheter main body, a tube member disposed on a side face side of the catheter hub and communicating with a lumen of the catheter hub, and a connector unit disposed at an end portion of the tube member opposite to the catheter hub, and a dilator member provided with a dilator main body that can be inserted into a lumen of the catheter main body and a dilator hub disposed at a proximal portion of the dilator main body, the storage container (100, 400) comprising: a side face part (121, 122, 123, 124) surrounding a space (110A, 110B, 410A, 410B) that is configured to accommodate the medical instrument; a first storage part (171, 471) configured to receive the catheter main body or the catheter hub; a second storage part (172, 472) configured to receive the tube member while the connector unit is disposed in the space (110A, 110B, 410A, 410B); and a third storage part (173, 473) configured to receive the dilator main body or the dilator hub, characterized in that the third storage part (173, 473) is disposed between the first storage part (171, 471) and the second storage part (172, 472), the storage container (100, 400) further comprises: an upper face part (131, 431) formed inside the side face part (121, 122, 123, 124) and on one end side of the side face part (121, 122, 123, 124); and a lower face part facing the upper face part (131, 431) with the side face part (121, 122, 123, 124) interposed therebetween, wherein the first storage part (171, 471) is a first hole part that allows the space to communicate with the outside of the space (110A, 110B, 410A, 410B) on the upper face part side, the second storage part (172, 472) is a second hole part that allows the space to communicate with the outside of the space (110A, 110B, 410A, 410B) on the upper face part side, the third storage part (173, 473) is a third hole part that allows the space to communicate with the outside of the space (110A, 110B, 410A, 410B) on the upper face part side, and the first hole part and the third hole part have a fixing part (171a, 471a) configured to fix the catheter member and the dilator member in a state in which a distal end of the catheter main body and a distal end of the dilator main body are not in contact with the lower face part. a side face part (121, 122, 123, 124) surrounding a space (110A, 110B, 410A, 410B) that is configured to accommodate the medical instrument; a first storage part (171, 471) configured to receive the catheter main body or the catheter hub; a second storage part (172, 472) configured to receive the tube member while the connector unit is disposed in the space (110A, 110B, 410A, 410B); and a third storage part (173, 473) configured to receive the dilator main body or the dilator hub, characterized in that the third storage part (173, 473) is disposed between the first storage part (171, 471) and the second storage part (172, 472), the storage container (100, 400) further comprises: an upper face part (131, 431) formed inside the side face part (121, 122, 123, 124) and on one end side of the side face part (121, 122, 123, 124); and a lower face part facing the upper face part (131, 431) with the side face part (121, 122, 123, 124) interposed therebetween, wherein the first storage part (171, 471) is a first hole part that allows the space to communicate with the outside of the space (110A, 110B, 410A, 410B) on the upper face part side, the second storage part (172, 472) is a second hole part that allows the space to communicate with the outside of the space (110A, 110B, 410A, 410B) on the upper face part side, the third storage part (173, 473) is a third hole part that allows the space to communicate with the outside of the space (110A, 110B, 410A, 410B) on the upper face part side, and the first hole part and the third hole part have a fixing part (171a, 471a) configured to fix the catheter member and the dilator member in a state in which a distal end of the catheter main body and a distal end of the dilator main body are not in contact with the lower face part. an upper face part (131, 431) formed inside the side face part (121, 122, 123, 124) and on one end side of the side face part (121, 122, 123, 124); and a lower face part facing the upper face part (131, 431) with the side face part (121, 122, 123, 124) interposed therebetween, wherein the first storage part (171, 471) is a first hole part that allows the space to communicate with the outside of the space (110A, 110B, 410A, 410B) on the upper face part side, the second storage part (172, 472) is a second hole part that allows the space to communicate with the outside of the space (110A, 110B, 410A, 410B) on the upper face part side, the third storage part (173, 473) is a third hole part that allows the space to communicate with the outside of the space (110A, 110B, 410A, 410B) on the upper face part side, and the first hole part and the third hole part have a fixing part (171a, 471a) configured to fix the catheter member and the dilator member in a state in which a distal end of the catheter main body and a distal end of the dilator main body are not in contact with the lower face part.