A liquid ejection apparatus (10, 10A, 100, 100A), comprising: a head (12, 112h) including: a nozzle which is configured to eject liquid; a supply port (16, 116) to which the liquid is continuously supplied; and a recovery port (18, 118) from which the liquid is continuously recovered; a supply flow channel (42, 142c, 142i) through which the liquid is supplied to the head (12, 112h); and a recovery flow channel (46, 146c, 146i) through which the liquid is recovered from the head (12, 112h), wherein: a flow channel resistance inside the head (12, 112h) from the supply port (16, 116) to the nozzle is R_HEAD_IN, a flow channel resistance inside the head (12, 112h) from the nozzle to the recovery port (18, 118) is R_HEAD_OUT, a flow channel resistance of the supply flow channel (42, 142c, 142i) is R_CHANNEL_IN, a flow channel resistance of the recovery flow channel (46, 146c, 146i) is R_CHANNEL_OUT, an inertance inside the head (12, 112h) from the supply port (16, 116) to the nozzle is M_HEAD_IN, an inertance inside the head (12, 112h) from the nozzle to the recovery port (18, 118) is M_HEAD_OUT, an inertance of the supply flow channel (42, 142c, 142i) is M_CHANNEL_IN, and an inertance of the recovery flow channel (46, 146c, 146i) is M_CHANNEL_OUT; when R_HEAD_IN > R_HEAD_OUT, the supply flow channel (42, 142c, 142i) and the recovery flow channel (46, 146c, 146i) are laid out so as to satisfy a condition of R_CHANNEL_IN > R_CHANNEL_OUT; when M_HEAD_IN > M_HEAD_OUT, the supply flow channel (42, 142c, 142i) and the recovery flow channel (46, 146c, 146i) are laid out so as to satisfy a condition of M_CHANNEL_IN > M_CHANNEL_OUT; and when M_HEAD_IN < M_HEAD_OUT, the supply flow channel (42, 142c, 142i) and the recovery flow channel (46, 146c, 146i) are laid out so as to satisfy a condition of M_CHANNEL_IN < M_CHANNEL_OUT. a head (12, 112h) including: a nozzle which is configured to eject liquid; a supply port (16, 116) to which the liquid is continuously supplied; and a recovery port (18, 118) from which the liquid is continuously recovered; a supply flow channel (42, 142c, 142i) through which the liquid is supplied to the head (12, 112h); and a recovery flow channel (46, 146c, 146i) through which the liquid is recovered from the head (12, 112h), wherein: a flow channel resistance inside the head (12, 112h) from the supply port (16, 116) to the nozzle is R_HEAD_IN, a flow channel resistance inside the head (12, 112h) from the nozzle to the recovery port (18, 118) is R_HEAD_OUT, a flow channel resistance of the supply flow channel (42, 142c, 142i) is R_CHANNEL_IN, a flow channel resistance of the recovery flow channel (46, 146c, 146i) is R_CHANNEL_OUT, an inertance inside the head (12, 112h) from the supply port (16, 116) to the nozzle is M_HEAD_IN, an inertance inside the head (12, 112h) from the nozzle to the recovery port (18, 118) is M_HEAD_OUT, an inertance of the supply flow channel (42, 142c, 142i) is M_CHANNEL_IN, and an inertance of the recovery flow channel (46, 146c, 146i) is M_CHANNEL_OUT; when R_HEAD_IN > R_HEAD_OUT, the supply flow channel (42, 142c, 142i) and the recovery flow channel (46, 146c, 146i) are laid out so as to satisfy a condition of R_CHANNEL_IN > R_CHANNEL_OUT; when M_HEAD_IN > M_HEAD_OUT, the supply flow channel (42, 142c, 142i) and the recovery flow channel (46, 146c, 146i) are laid out so as to satisfy a condition of M_CHANNEL_IN > M_CHANNEL_OUT; and when M_HEAD_IN < M_HEAD_OUT, the supply flow channel (42, 142c, 142i) and the recovery flow channel (46, 146c, 146i) are laid out so as to satisfy a condition of M_CHANNEL_IN < M_CHANNEL_OUT. a flow channel resistance inside the head (12, 112h) from the supply port (16, 116) to the nozzle is R_HEAD_IN, a flow channel resistance inside the head (12, 112h) from the nozzle to the recovery port (18, 118) is R_HEAD_OUT, a flow channel resistance of the supply flow channel (42, 142c, 142i) is R_CHANNEL_IN, a flow channel resistance of the recovery flow channel (46, 146c, 146i) is R_CHANNEL_OUT, an inertance inside the head (12, 112h) from the supply port (16, 116) to the nozzle is M_HEAD_IN, an inertance inside the head (12, 112h) from the nozzle to the recovery port (18, 118) is M_HEAD_OUT, an inertance of the supply flow channel (42, 142c, 142i) is M_CHANNEL_IN, and an inertance of the recovery flow channel (46, 146c, 146i) is M_CHANNEL_OUT; when R_HEAD_IN > R_HEAD_OUT, the supply flow channel (42, 142c, 142i) and the recovery flow channel (46, 146c, 146i) are laid out so as to satisfy a condition of R_CHANNEL_IN > R_CHANNEL_OUT; when M_HEAD_IN > M_HEAD_OUT, the supply flow channel (42, 142c, 142i) and the recovery flow channel (46, 146c, 146i) are laid out so as to satisfy a condition of M_CHANNEL_IN > M_CHANNEL_OUT; and when M_HEAD_IN < M_HEAD_OUT, the supply flow channel (42, 142c, 142i) and the recovery flow channel (46, 146c, 146i) are laid out so as to satisfy a condition of M_CHANNEL_IN < M_CHANNEL_OUT.