Piperidine derivative, liquid crystal composition and liquid crystal display device

A compound represented by any of formulas (1-1) to (1-4):

• wherein, in formulas (1-1) to (1-4),
• M is aliphatic hydrocarbon group having 1 to 20 carbons or aromatic hydrocarbon group having 1 to 20 carbons, and in the groups, at least one —CH2— may be replaced by —O— or —S—, one or two —CH═CH— may be replaced by —CH═N—, and at least one of hydrogen may be replaced by fluorine or chlorine;
• Z is a single bond, —O—, —COO—, or —OCO—;
• Q is a monovalent group represented by formula (Q-1), (Q-2) or (Q-3), in which Ra is hydrogen, —O., —OH, or —R1;
• Rb is hydrogen, fluorine or —R2;
• R1 and R2 are independently an alkyl having 1 to 20 carbons, arylalkyl having 1 to 20 carbons, or aryl having 1 to 20 carbons, and in the alkyl, at least one —CH2— may be replaced by —O—, —CO—, —COO—, or —OCO—, and —CH3 located at a terminal may be replaced by —NHR3 or —NR4R5, in which R3, R4, and R5 are independently alkyl having 1 to 10 carbons.