Vehicular sunroof unit

1. A vehicular sunroof unit, comprising:

a movable panel that moves in a vehicle front-rear direction between a full closed position of closing a roof opening of a vehicle body and a full open position of opening the roof opening;

a screen that is developed in a space of the roof opening toward a front of the vehicle when the movable panel moves from the full closed position to a rear of the vehicle, and is folded and stored when the movable panel moves from the full open position to the front of the vehicle; and

an arm that rotates about a shaft line extending in a width direction of the vehicle between a developing position of developing the screen and a storing position of storing the screen while supporting the screen at a tip, and is biased toward the developing position, wherein

the movable panel includes a sliding portion that positions the arm by sliding with the arm,

the sliding portion includes a front sliding portion, and a rear sliding portion located closer to the rear of the vehicle than the front sliding portion,

a movement range of the movable panel includes a first sliding range in which the front sliding portion slides with the arm, and a second sliding range that is a movement range closer to the front of the vehicle than the first sliding range and in which the rear sliding portion slides with the arm, and

a gap is generated between the front sliding portion and the arm when the movable panel moves in the second sliding range.

2. The vehicular sunroof unit according to claim 1 , wherein,

under a circumstance where the rear sliding portion slides with the arm, a gap generated between the front sliding portion and the arm is a gap greater than or equal to twice as thick as a thickness of the screen.