A splicer apparatus in which, is a state where at least one yarn of a plurality of yarns is currently used, the currently used yarn can be pieced into at least one different yarn, comprising: a holder portion that holds tip end portions of yarns that are not currently used among the plurality of yarns; a selecting portion that selects a yarn that is to be used for piecing, from among the yarns that are held by the holder portion; a head that performs piecing by joining the yarn selected by the selecting portion and the currently used yearn, using a flow of compressed fluid in a groove that is formed from an inlet positioned on an opposite side of the holder portion to an outlet positioned on a side of the holder portion; a yarn guide lever that catches the yarn selected by the selecting portion and guides the yarn to the inlet of the groove of the head; a first driving portion that drives the yarn guide lever; a suction portion that sucks a yarn at a position near the outlet of the groove of the head; a cutter that cuts the currently used yarn and the selected yarn that are pieced into each other, at a position near the outlet of the groove of the head; a second driving portion that drives the cutter in conjunction with the yarn guide lever; and characterized by comprising a base that has a partition wall, and supports the holder portion, the selecting portion, the head, the yarn guide lever, the first driving portion, the suction portion, the cutter, and the second driving portion so that mutual positional relation is maintained, wherein at least the holder portion, the head, the yarn guide lever, the cutter, and the suction portion are arranged on a first side of the partition wall and at least the first and the second driving portions are arranged on a second side of the partition wall. a holder portion that holds tip end portions of yarns that are not currently used among the plurality of yarns; a selecting portion that selects a yarn that is to be used for piecing, from among the yarns that are held by the holder portion; a head that performs piecing by joining the yarn selected by the selecting portion and the currently used yearn, using a flow of compressed fluid in a groove that is formed from an inlet positioned on an opposite side of the holder portion to an outlet positioned on a side of the holder portion; a yarn guide lever that catches the yarn selected by the selecting portion and guides the yarn to the inlet of the groove of the head; a first driving portion that drives the yarn guide lever; a suction portion that sucks a yarn at a position near the outlet of the groove of the head; a cutter that cuts the currently used yarn and the selected yarn that are pieced into each other, at a position near the outlet of the groove of the head; a second driving portion that drives the cutter in conjunction with the yarn guide lever; and characterized by comprising a base that has a partition wall, and supports the holder portion, the selecting portion, the head, the yarn guide lever, the first driving portion, the suction portion, the cutter, and the second driving portion so that mutual positional relation is maintained, wherein at least the holder portion, the head, the yarn guide lever, the cutter, and the suction portion are arranged on a first side of the partition wall and at least the first and the second driving portions are arranged on a second side of the partition wall.