To provide a sanitary safety bag whose content is never leaked out however it is moved and wherever it is arranged, especially even if the content is a liquid.

This bag consists of a soft material such as a thin transparent plastic sheet body and is provided with an opening part 2 of a size suitable for a use and a tip part suitable for welding a reinforcing member 3b facilitating opening a route through which the inside and the opening part communicate with each other from a flat state where the opening part is closed. In addition, the safety bag 1 including a first tube-like element 4 which is prevented from leaking and welded near the opening part includes a second tube-like element 5, which is arranged between the opposed wall parts of the bag 1 and the opposed wall parts of the element 4 and is also prevented from leaking and closely stuck to the bag near the opening part.