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(57) Abstract: A novel quaternary ammonium salt compound having excellent antibacterial activity, and an immobilized antibacterial agent and a polymer-type immobilized antibacterial agent are provided. SOLUTION: General formula (1): [Wherein, R 1 and R 2 are the same or different and each have 1 to 3 carbon atoms. Represents an alkyl group. R 3 represents an optionally substituted alkyl group having 6 to 18 carbon atoms. R 4 represents a hydroxyl group, an amino group or a mercapto group. X represents a residue of an organic acid or an inorganic acid. h, i and k are the same or different and represent an integer of 0 to 17, j represents 0 or 1, and h, The sum of i, j and k is 17 or less. l shows the integer of 0-18. ] A quaternary ammonium salt compound of the dimer type represented by the formula: |