Biofilm formation inhibiting agent and/or removing agent, and biofilm formation inhibiting method and/or removing method

The objective of the present invention is to provide a highly safe agent that has excellent biofilm formation inhibiting capability and/or formed biofilm removing capability, and a biofilm formation inhibiting method and/or a biofilm removing method using the agent. Provided are a biofilm formation inhibiting agent and/or removing agent containing, as an active ingredient, at least one selected from anthranilic acid or an anthranilic acid derivative represented by general formula (1), or a salt of those, and a biofilm formation inhibiting method and/or removing method using the biofilm formation inhibiting agent and/or removing agent. (In the formula, each of R1-R4 independently represents the following: R1: C(=O)OH (carboxyl group), C(=O)NH2, C(=O)OCnH2n+1 (alkyl ester n=1-4). R2, R3: halogen atom, nitro group, hydrogen atom. R4: hydrogen atom, CH3C(=O) (acetyl group), CH3C(=O)CH2C(=O) (acetoacetyl group)). 本发明的课题在于，提供：安全性高、且生物膜的形成抑制能力和/或所形成的生物膜的除去能力优异的药剂以及使用其的生物膜的形成抑制方法和/或生物膜除去方法。提供生物膜形成抑制剂和/或除去剂、以及使用它们的生物膜