The present invention provides a new amide compound and salt thereof that is capable of inhibiting biofilm formation or removing deposited biofilms. The present invention also provides a biofilm formation inhibitor or a biofilm remover containing the amide compound or salt thereof as an active ingredient.An amide compound or salt thereof according to the present invention is denoted by General Formula (1):wherein R1 is a hydrogen atom or a hydroxyl group, R2 is a C5-12 alkyl group, and Q is a substituent denoted by Formula (Q1) or (Q2),wherein n and m are 0 or 1.
