Formwork system comprising: - an upper formwork support, - a lower formwork support which is arranged transversely to the upper formwork support, - a securing device which is in each case connected to the lower formwork support and the upper formwork support, the securing device comprising, for securing the upper formwork support on the lower formwork support: - a first contact portion resting against a first inner surface of an upper flange of the lower formwork support; - a second contact portion resting against a first lateral surface of the upper flange of the lower formwork support; - a third contact portion resting against a first inner surface of a lower flange of the upper formwork support; - a fourth contact portion resting against a second inner surface of the lower flange of the upper formwork support, the fourth contact portion being spaced apart from the third contact portion in a first horizontal direction; - a fifth contact portion resting against a second lateral surface of the upper flange of the lower formwork support, the fifth contact portion being spaced apart from the second contact portion in a second horizontal direction, characterised by: - a tenth contact portion resting against a first outer surface of a web of the lower formwork support, which web connects the upper flange to the lower flange. - an upper formwork support, - a lower formwork support which is arranged transversely to the upper formwork support, - a securing device which is in each case connected to the lower formwork support and the upper formwork support, the securing device comprising, for securing the upper formwork support on the lower formwork support: - a first contact portion resting against a first inner surface of an upper flange of the lower formwork support; - a second contact portion resting against a first lateral surface of the upper flange of the lower formwork support; - a third contact portion resting against a first inner surface of a lower flange of the upper formwork support; - a fourth contact portion resting against a second inner surface of the lower flange of the upper formwork support, the fourth contact portion being spaced apart from the third contact portion in a first horizontal direction; - a fifth contact portion resting against a second lateral surface of the upper flange of the lower formwork support, the fifth contact portion being spaced apart from the second contact portion in a second horizontal direction, characterised by: - a tenth contact portion resting against a first outer surface of a web of the lower formwork support, which web connects the upper flange to the lower flange. - a first contact portion resting against a first inner surface of an upper flange of the lower formwork support; - a second contact portion resting against a first lateral surface of the upper flange of the lower formwork support; - a third contact portion resting against a first inner surface of a lower flange of the upper formwork support; - a fourth contact portion resting against a second inner surface of the lower flange of the upper formwork support, the fourth contact portion being spaced apart from the third contact portion in a first horizontal direction; - a fifth contact portion resting against a second lateral surface of the upper flange of the lower formwork support, the fifth contact portion being spaced apart from the second contact portion in a second horizontal direction, - a tenth contact portion resting against a first outer surface of a web of the lower formwork support, which web connects the upper flange to the lower flange.