The present invention provides: a substrate provided with an antibacterial layer, the substrate being provided with an antibacterial layer that promptly exhibits antibacterial action and that enables antibacterial properties to be maintained for a prolonged period of time； an antibacterial sheet； a radiography device； and a touch panel. This substrate provided with an antibacterial layer has a substrate and an antibacterial layer disposed on at least part of the surface of the substrate, wherein the antibacterial layer has a silver-containing first antibacterial agent, and a silver-containing second antibacterial agent that differs from the first antibacterial agent. Taking P to be the amount of silver per unit area included in the antibacterial layer and Q to be the amount of silver ions per unit area as measured using an extraction test, the relationships in formulae (1) and (2) are satisfied. (1) 6.0 &le； P/Q (2) 15.0 &le； Q.本發明提供具備能夠在短時間內顯示抗菌作用並且能夠長時間維持抗菌性的抗菌層的帶抗菌層的基材、抗菌片、放射線攝影裝置、觸控面板。本發明的帶抗菌層的基材具有基材和配置於基材表面的至少一部分的抗菌層，抗菌層具有包含銀的第1抗菌劑和與第1抗菌劑不同的、包含銀的第2抗菌劑，在將每單位面積的抗菌層中所包含的銀含量設為P、且將利用提取試驗測定的每單位面積的銀離子量設為Q時，滿足以下的式（1）及式（2）的關係。 式（1） 6.0≤P/Q 式（2） 15.0≤Q
