An injecting machine for injecting brine into meat pieces comprising: a conveyor having a support surface for conveying meat pieces in a forward direction; at least first and second injection heads (1, 2) consecutively arranged over said conveyor relative to said forward direction; a plurality of parallel hollow needles mounted on each first and second injection head (1, 2), each needle having a longitudinal inner passage, at least one inlet opening in communication with said inner passage at an upper needle portion and a plurality of outlet openings in communication with the inner passage distributed along a lower needle portion; head driving means for reciprocating said first and second injection heads (1, 2) between an upper position (UP1, UP2), in which the tip of said needles is at a distance from said support surface of said conveyor sufficient for enabling the meat pieces to pass under the injection heads (1, 2), and a lower position (LP1, LP2), in which said lower needle portions of the needles are stuck into the meat pieces located under the injection heads (1, 2); and brine supplying means for supplying brine to said inlet opening of the needles at least when the first and second injection heads (1,2) are in said lower position (LP1, LP2); wherein said head driving means are arranged for alternately reciprocating said first and second injection heads (1, 2) so that when one of them is at said upper position (UP1, UP2) the other one is at the lower position (LP1, LP2), and vice versa; and the first and second injection heads (1, 2) are installed at different heights over the conveyor so that the upper position of the first injection head is at a lower level in comparison with the upper position of the second injection head. a conveyor having a support surface for conveying meat pieces in a forward direction; at least first and second injection heads (1, 2) consecutively arranged over said conveyor relative to said forward direction; a plurality of parallel hollow needles mounted on each first and second injection head (1, 2), each needle having a longitudinal inner passage, at least one inlet opening in communication with said inner passage at an upper needle portion and a plurality of outlet openings in communication with the inner passage distributed along a lower needle portion; head driving means for reciprocating said first and second injection heads (1, 2) between an upper position (UP1, UP2), in which the tip of said needles is at a distance from said support surface of said conveyor sufficient for enabling the meat pieces to pass under the injection heads (1, 2), and a lower position (LP1, LP2), in which said lower needle portions of the needles are stuck into the meat pieces located under the injection heads (1, 2); and brine supplying means for supplying brine to said inlet opening of the needles at least when the first and second injection heads (1,2) are in said lower position (LP1, LP2); wherein said head driving means are arranged for alternately reciprocating said first and second injection heads (1, 2) so that when one of them is at said upper position (UP1, UP2) the other one is at the lower position (LP1, LP2), and vice versa; and the first and second injection heads (1, 2) are installed at different heights over the conveyor so that the upper position of the first injection head is at a lower level in comparison with the upper position of the second injection head.