1 . A fluorine-containing ether compound represented by the following formula 1, R f [-R 1 -O-C( O)-Q 1 {-T} g ] j Formula 1 wherein R f is a polyfluoropolyether chain in which at least one fluorine atom is bonded to a carbon atom bonded to R 1 , R 1 is an alkylene group having 1 to 10 carbon atoms optionally having a substituent (other than a fluorine atom), and a plurality of R 1 may be the same or different, Q 1 is a (g+1)-valent organic group having a carbon atom bonded to -O-C( O)- in formula 1, and when there are a plurality of Q 1 , the plurality of Q 1 may be the same or different, T is -Si(R) 3-a (L) a , and when there are two or more T, the two or more T may be the same or different, R is an alkyl group, L is a hydrolyzable group or a hydroxyl group, and two or more L in T may be the same or different, a is 2 or 3, g is an integer of 1 or more, and when there are a plurality of g, the plurality of g may be the same or different, and j is 1 or 2.
2 . The fluorine-containing ether compound according to claim 1 , wherein Q 1 is represented by any of the following formulas (Q1) to (Q7): -A 1 -C(R e2 ) 3-g3 (-Q 22 -) g3 Formula (Q2) -A 2 -N(-Q 23 -) 2 Formula (Q3) -A 3 -Z 1 (-Q 24 -) g4 Formula (Q4) -A 2 -Si(R e3 ) 3-g3 (-Q 25 -) g3 Formula (Q5) -A 1 -Q 26 - Formula (Q6) -A 1 -CH(-Q 22 -)-Si(R e3 ) 3-g5 (-Q 25 -) g5 Formula (Q7) wherein, in formulas (Q1) to (Q7), the A 1 , A 2 , or A 3 side is linked to -O-C( O)- in formula 1, and the Q 22 , Q 23 , Q 24 , Q 25 , or Q 26 side is linked to T, A 1 is a single bond, an alkylene group, or a group having -C(O)NR e6 -, -C(O)-, -NR e6 -, or -O- between carbon-carbon atoms of an alkylene group having two or more carbon atoms, A 2 is an alkylene group or a group having -C(O)NR e6 -, -C(O)-, -NR e6 -, or -O-between carbon-carbon atoms of an alkylene group having two or more carbon atoms, A 3 is A 1 when the atom in Z 1 to which A 3 is bonded is a carbon atom, and is A 2 when the atom in Z 1 to which A 3 is bonded is a nitrogen atom, Q 11 is a single bond, -O-, an alkylene group, a group having -C(O)NR e6 -, -C(O)-, -NR e6 -, or -O-between carbon-carbon atoms of an alkylene group having two or more carbon atoms, Q 22 is an alkylene group, a group having -C(O)NR e6 -, -C(O)-, -NR e6 -, or -O-between carbon-carbon atoms of an alkylene group having two or more carbon atoms, a group having-C(O)NR e6 -, -C(O)-, -NR e6 -, or -O- at an end on the side not linked to the T of the alkylene group, or a group having -C(O) NR e6 -, -C(O)-, -NR e6 -, or -O- between carbon-carbon atoms of an alkylene group having two or more carbon atoms and having -C(O)NR e6 -, -C(O)-, -NR e6 -, or -O- at an end on the side not linked to the T of the alkylene group, and when Q 1 has two or more Q 22 , the two or more Q 22 may be the same or different, Q 23 is an alkylene group or a group having -C(O)NR e6 , -C(O)-, -NR e6 -, or -O- between carbon-carbon atoms of an alkylene group having two or more carbon atoms, and the two Q 23 may be the same or different, Q 24 is Q 22 when the atom in Z 1 to which Q 24 is bonded is a carbon atom, is Q 23 when the atom in Z 1 to which Q 24 is bonded is a nitrogen atom, and when Q 1 has two or more Q 24 , the two or more Q 24 may be the same or different, Q 25 is an alkylene group or a group having -C(O)NR e6 -, -C(O)-, -NR e6 -, or -O- between carbon-carbon atoms of an alkylene group having two or more carbon atoms, and when Q 1 has two or more Q 25 , the two or more Q 25 may be the same or different, Q 26 is an alkylene group or a group having -C(O)NR e6 -, -C(O)-, -NR e6 -, or -O- between carbon-carbon atoms of an alkylene group having two or more carbon atoms, Z 1 is a (g4+1)-valent group having a ring structure having a carbon atom or nitrogen atom to which A 3 is directly bonded and a carbon atom or nitrogen atom to which Q 24 is directly bonded, R e1 is a hydrogen atom or an alkyl group, and when Q 1 has two or more Rel, the two or more R e1 may be the same or different, R e2 is a hydrogen atom, a hydroxyl group, an alkyl group, or an acyloxy group, R e3 is an alkyl group, R e6 is a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a phenyl group, g1 is an integer from 0 to 3, g2 is an integer from 0 to 3, and g1+g2 is an integer from 1 to 6, g3 is an integer from 1 to 3, g4 is an integer greater than or equal to one, and g5 is an integer from 0 to 3.
3 . A surface treatment agent comprising the fluorine-containing ether compound according to claim 1 .