An evaporative fuel control apparatus for use in an internal combustion engine having intake passages (24a to 24d) that supply intake air to plural cylinder chambers, and a throttle valve disposed in the intake passages (24a to 24d) for controlling a flow rate of the intake air, wherein vaporized evaporative fuel is supplied through the intake passages (24a to 24d) into the cylinder chambers, the evaporative fuel control apparatus comprising: a bypass passage made up from an upstream side passage connected to an upstream side of the throttle valve in the intake passages (24a to 24d), and plural downstream side passages (50a to 50d), which are connected to downstream sides of the throttle valve in the intake passages (24a to 24d); characterised by a switching valve (42, 100) connected to the bypass passage, and having a body, a single valve body (56, 102) disposed displaceably inside the body, and a drive unit for displacing the single valve body (56, 102) in an axial direction thereof, the switching valve (42, 100) being capable of switching a communication state of the bypass passage by displacement of the single valve body (56, 102) for controlling simultaneous opening and closing of the plural downstream side passages (50a to 50d) by means of the single valve body (56, 102); and a purge passage connected to the switching valve (42, 100), the evaporative fuel flowing through the purge passage, wherein the purge passage and the bypass passage are connected to the body while being separated mutually in the axial direction along which the valve body (56, 102) is displaced, and the switching valve (42, 100) is switched between a first state in which the upstream side passage communicates with the downstream side passages (50a to 50d), and a second state in which the purge passage communicates with the downstream side passages (50a to 50d) via a communication section (60, 104 a - d) provided on the valve body (56, 102), by displacement of the valve body (56, 102) in the axial direction, wherein the drive unit comprises a rotary drive source that rotates a drive shaft, the valve body (56, 102) being screw-engaged with respect to the drive shaft. a bypass passage made up from an upstream side passage connected to an upstream side of the throttle valve in the intake passages (24a to 24d), and plural downstream side passages (50a to 50d), which are connected to downstream sides of the throttle valve in the intake passages (24a to 24d); characterised by a switching valve (42, 100) connected to the bypass passage, and having a body, a single valve body (56, 102) disposed displaceably inside the body, and a drive unit for displacing the single valve body (56, 102) in an axial direction thereof, the switching valve (42, 100) being capable of switching a communication state of the bypass passage by displacement of the single valve body (56, 102) for controlling simultaneous opening and closing of the plural downstream side passages (50a to 50d) by means of the single valve body (56, 102); and a purge passage connected to the switching valve (42, 100), the evaporative fuel flowing through the purge passage, wherein the purge passage and the bypass passage are connected to the body while being separated mutually in the axial direction along which the valve body (56, 102) is displaced, and the switching valve (42, 100) is switched between a first state in which the upstream side passage communicates with the downstream side passages (50a to 50d), and a second state in which the purge passage communicates with the downstream side passages (50a to 50d) via a communication section (60, 104 a - d) provided on the valve body (56, 102), by displacement of the valve body (56, 102) in the axial direction, wherein the drive unit comprises a rotary drive source that rotates a drive shaft, the valve body (56, 102) being screw-engaged with respect to the drive shaft.