Transplanter machine for seedlings rooted in sods, adapted to operate according to a direction of travel, comprising: - a supporting frame connectable to an agricultural machine; - means for resting and advancing on the ground in said direction of travel; - at least one transplanter unit, where said at least one transplanter unit comprises: - a feeder for a plurality of seedlings, rotatingly supported by a substantially vertical axis, comprising a hole with vertical axis (y) through which said seedlings are delivered in sequence; - distribution means for said plurality of seedlings, comprising a first cup, provided with two oblique lateral walls (6a, 6b) having a mutual opening movement, and adapted to perforate and prepare the ground to deposit the single seedlings into it; - a header having a tubular shape, comprising a plurality of portions (7a, 7b, 7c) connected to one another so as to obtain a segmented or curvilinear trend, provided with an inlet for said seedlings positioned in proximity of said feeder, and an outlet for said seedlings, where said transplanter unit is characterized in that: - said feeder is rotating and is rotatingly supported by a substantially vertical axis; - said distribution means comprise two parallel toothed discs (8, 9), offset against one another, between which is provided a plurality of cups; - said heeder is positioned and extends laterally with respect to the direction of travel of said transplanter machine, extending until it is in close proximity to the ground, so as to convey said seedlings into said plurality of cups when the two oblique lateral walls (6a, 6b) of each cup are sunk into and open in the ground, so as to deposit the seedling directly in said ground; - said header has a direction of longitudinal extension (x) that belongs to a plane (π) substantially orthogonal to the direction of travel of the transplanter machine and the axis (y) of said hole of the rotary feeder belongs to said plane (π). - a supporting frame connectable to an agricultural machine; - means for resting and advancing on the ground in said direction of travel; - at least one transplanter unit, - a feeder for a plurality of seedlings, rotatingly supported by a substantially vertical axis, comprising a hole with vertical axis (y) through which said seedlings are delivered in sequence; - distribution means for said plurality of seedlings, comprising a first cup, provided with two oblique lateral walls (6a, 6b) having a mutual opening movement, and adapted to perforate and prepare the ground to deposit the single seedlings into it; - a header having a tubular shape, comprising a plurality of portions (7a, 7b, 7c) connected to one another so as to obtain a segmented or curvilinear trend, provided with an inlet for said seedlings positioned in proximity of said feeder, and an outlet for said seedlings, - said feeder is rotating and is rotatingly supported by a substantially vertical axis; - said distribution means comprise two parallel toothed discs (8, 9), offset against one another, between which is provided a plurality of cups; - said heeder is positioned and extends laterally with respect to the direction of travel of said transplanter machine, extending until it is in close proximity to the ground, so as to convey said seedlings into said plurality of cups when the two oblique lateral walls (6a, 6b) of each cup are sunk into and open in the ground, so as to deposit the seedling directly in said ground; - said header has a direction of longitudinal extension (x) that belongs to a plane (π) substantially orthogonal to the direction of travel of the transplanter machine and the axis (y) of said hole of the rotary feeder belongs to said plane (π).