A diving mask comprising: - a rigid frame having a front perimeter edge and a rear perimeter edge, said rigid frame provided with an upper portion, a lower portion, and a first and a second lateral portion (14a,14b) arranged to connect said upper portion to said lower portion; - a visor made of a transparent material and engaged to said rigid frame, said visor being configured in such a way to protrude, in use, beyond said front perimeter edge of said rigid frame; - an inhalation duct, or snorkel, integral, in use, to said upper portion of said rigid frame, said inhalation duct being provided with a longitudinal passage; - a face member made of a flexible material configured to be engaged inside of said rigid frame and having a rear edge configured to be arranged, in use, in contact with the user's face, said face member comprising a partition member configured to divide the volume between said visor and said face member in an upper chamber pneumatically connected to said inhalation duct, or snorkel, through at least an opening, and in a lower chamber arranged to house, in use, the nose and the mouth of the user; - at least a one-way valve arranged to pneumatically connect said upper chamber with said lower chamber and configured to allow the air to pass from said upper chamber to said lower chamber during the user's inspiration, and to impede, instead, the air to pass in the opposite direction, that means from said lower chamber to said upper chamber during the user's expiration; - at least an exit mouth for the exit of the air breathed out by the user; - at least a discharge duct configured to pneumatically connect said lower chamber with said, or each, exit mouth; said diving mask being characterised in that said, or each, exit mouth is provided at said rear perimeter edge of said upper portion of said rigid frame. - a rigid frame having a front perimeter edge and a rear perimeter edge, said rigid frame provided with an upper portion, a lower portion, and a first and a second lateral portion (14a,14b) arranged to connect said upper portion to said lower portion; - a visor made of a transparent material and engaged to said rigid frame, said visor being configured in such a way to protrude, in use, beyond said front perimeter edge of said rigid frame; - an inhalation duct, or snorkel, integral, in use, to said upper portion of said rigid frame, said inhalation duct being provided with a longitudinal passage; - a face member made of a flexible material configured to be engaged inside of said rigid frame and having a rear edge configured to be arranged, in use, in contact with the user's face, said face member comprising a partition member configured to divide the volume between said visor and said face member in an upper chamber pneumatically connected to said inhalation duct, or snorkel, through at least an opening, and in a lower chamber arranged to house, in use, the nose and the mouth of the user; - at least a one-way valve arranged to pneumatically connect said upper chamber with said lower chamber and configured to allow the air to pass from said upper chamber to said lower chamber during the user's inspiration, and to impede, instead, the air to pass in the opposite direction, that means from said lower chamber to said upper chamber during the user's expiration; - at least an exit mouth for the exit of the air breathed out by the user; - at least a discharge duct configured to pneumatically connect said lower chamber with said, or each, exit mouth;