A vehicular air conditioning device mounted on a vehicle to feed conditioned air to an interior of the vehicle, the vehicular air conditioning device comprising: an air conditioning case that includes a first case introduction port (VS1a, VS1b) and a second case introduction port through each of which air is introduced, and a first case discharge port and a second case discharge port through each of which the introduced air is discharged; and a fan that includes a plurality of blade portions arranged at intervals, and rotates about a rotation axis inside the air conditioning case to draw the air and blow out the air in a direction away from the rotation axis, wherein the first case introduction port is offset to one side in a left-right direction of the vehicle relative to the second case introduction port, the first case discharge port is offset upward in an up-down direction of the vehicle relative to the rotation axis, the second case discharge port is offset downward in the up-down direction of the vehicle relative to the rotation axis, the air conditioning case includes a partition plate disposed on an airflow upstream side of the fan, and an inner guide plate disposed inside the plurality of blade portions in a radial direction around the rotation axis, the partition plate partitions a space (VS3, VS4) on an air flow upstream side of the fan into a first passage located on the one side of the partition plate in the left-right direction of the vehicle, and a second passage located on an other side of the partition plate in the left-right direction of the vehicle, the first passage communicates with the first case introduction port, and the second passage communicates with the second case introduction port, the inner guide plate has a first inner guide surface and a second inner guide surface, the first inner guide surface being located on the one side of the second inner guide plate in the left-right direction of the vehicle, the air introduced through the first case introduction port is guided by the first inner guide surface to be drawn from the first passage into the fan, the air being blown upward by the fan to flow through the first case discharge port, and the air introduced through the second case introduction port is guided by the second inner guide surface to be drawn from the second passage into the fan, the air being blown downward by the fan to flow through the second case discharge port. an air conditioning case that includes a first case introduction port (VS1a, VS1b) and a second case introduction port through each of which air is introduced, and a first case discharge port and a second case discharge port through each of which the introduced air is discharged; and a first case introduction port (VS1a, VS1b) and a second case introduction port through each of which air is introduced, and a first case discharge port and a second case discharge port through each of which the introduced air is discharged; and a fan that includes a plurality of blade portions arranged at intervals, and rotates about a rotation axis inside the air conditioning case to draw the air and blow out the air in a direction away from the rotation axis, wherein the first case introduction port is offset to one side in a left-right direction of the vehicle relative to the second case introduction port, the first case discharge port is offset upward in an up-down direction of the vehicle relative to the rotation axis, the second case discharge port is offset downward in the up-down direction of the vehicle relative to the rotation axis, the air conditioning case includes a partition plate disposed on an airflow upstream side of the fan, and an inner guide plate disposed inside the plurality of blade portions in a radial direction around the rotation axis, a partition plate disposed on an airflow upstream side of the fan, and an inner guide plate disposed inside the plurality of blade portions in a radial direction around the rotation axis, the partition plate partitions a space (VS3, VS4) on an air flow upstream side of the fan into a first passage located on the one side of the partition plate in the left-right direction of the vehicle, and a second passage located on an other side of the partition plate in the left-right direction of the vehicle, the first passage communicates with the first case introduction port, and the second passage communicates with the second case introduction port, the inner guide plate has a first inner guide surface and a second inner guide surface, the first inner guide surface being located on the one side of the second inner guide plate in the left-right direction of the vehicle, the air introduced through the first case introduction port is guided by the first inner guide surface to be drawn from the first passage into the fan, the air being blown upward by the fan to flow through the first case discharge port, and the air introduced through the second case introduction port is guided by the second inner guide surface to be drawn from the second passage into the fan, the air being blown downward by the fan to flow through the second case discharge port.