Antibacterial layer-attached base material, antibacterial sheet, radiation photographing device, and touch panel

An antibacterial layer-attached base material comprising:

• a base material;
• and
• an antibacterial layer which is disposed on at least a part of the surface of the base material,
• wherein the antibacterial layer contains at least one antibacterial agent containing silver,
• wherein the amount of silver ions per a unit area measured in the following extraction test is 15.8 to 40 ng/cm2,
• wherein, in the extraction test, the amount of silver ions per a unit area is obtained by using a 1/500 common broth medium defined in JIS Z 2801:2010 as an extraction liquid, controlling the temperature of the extraction liquid so as to be at 35±1° C., bringing the extraction liquid into contact with the antibacterial layer in the antibacterial layer-attached base material for an hour, measuring the amount of silver ions extracted in the extraction liquid, and dividing the obtained value by the contact area of the antibacterial layer with respect to the extraction liquid;
• the unit of the amount of silver ions is ng;
• the unit of the contact area is cm2;
• and the unit of the amount of silver ions per a unit area is ng/cm2,
• wherein the antibacterial layer is formed by subjecting a curable composition containing at least a monomer having a polyoxyalkylene group and a polymerizable group and the antibacterial agent to a curing treatment,
• wherein the mass percentage of the antibacterial agent with respect to the mass of the total solid content of components of the cured material in the antibacterial layer is between 0.5% and 2.0%,
• wherein the antibacterial layer in the form of a film with a thickness of 4.0 μm to 5.0 μm, and
• wherein the water contact angle is between 20° and 25°.