A transaxle device for a hybrid vehicle including an engine, a first rotating electric machine, and a second rotating electric machine and operable to individually transmit power of the engine and power of the first rotating electric machine to an output shaft on a drive wheel side and also to transmit the power of the engine to the second rotating electric machine, the transaxle device comprising: an input shaft which is coaxially connected to a rotating shaft of the engine; a first rotating electric machine shaft which is coaxially connected to a rotating shaft of the first rotating electric machine; a second rotating electric machine shaft which is coaxially connected to a rotating shaft of the second rotating electric machine and includes a fixed gear normally engaging with a fixed gear provided in the input shaft; a first counter shaft which is a rotating shaft disposed on a power transmission path between the input shaft and the output shaft; a second counter shaft which is a rotating shaft disposed on a power transmission path between the first rotating electric machine shaft and the output shaft; and a switching mechanism (20A to 20F) which is disposed on the input shaft to switch a high gear stage and a low gear stage and includes an annular sleeve which is combined with the input shaft so as not to be relatively rotatable and to be slidable in the axial direction, wherein each of the input shaft, the output shaft, the first rotating electric machine shaft, the second rotating electric machine shaft and the second counter shaft is located above an oil level of oil collected inside a casing of the transaxle device and the first counter shaft is immersed in the oil while the hybrid vehicle is stopped, and wherein the annular sleeve is configured to turn at least one idle gear (11H, 11L) of the high gear stage and the low gear stage into a rotational connection state with respect to the input shaft by moving in the axial direction. an input shaft which is coaxially connected to a rotating shaft of the engine; a first rotating electric machine shaft which is coaxially connected to a rotating shaft of the first rotating electric machine; a second rotating electric machine shaft which is coaxially connected to a rotating shaft of the second rotating electric machine and includes a fixed gear normally engaging with a fixed gear provided in the input shaft; a first counter shaft which is a rotating shaft disposed on a power transmission path between the input shaft and the output shaft; a second counter shaft which is a rotating shaft disposed on a power transmission path between the first rotating electric machine shaft and the output shaft; and a switching mechanism (20A to 20F) which is disposed on the input shaft to switch a high gear stage and a low gear stage and includes an annular sleeve which is combined with the input shaft so as not to be relatively rotatable and to be slidable in the axial direction, wherein each of the input shaft, the output shaft, the first rotating electric machine shaft, the second rotating electric machine shaft and the second counter shaft is located above an oil level of oil collected inside a casing of the transaxle device and the first counter shaft is immersed in the oil while the hybrid vehicle is stopped, and wherein the annular sleeve is configured to turn at least one idle gear (11H, 11L) of the high gear stage and the low gear stage into a rotational connection state with respect to the input shaft by moving in the axial direction.