The concept of international solidarity has been developing since the second half of the 20th
century within the scope of international charters, conventions and declarations of protection
of human rights. It has earned the qualities of the principle of international law and has been
given a meaning of the key human right which binds together human rights of the first, second
and third generation. With this work the author provides an explanation and gives a postulate
to the legal nature of international solidarity and its legal feasibility. Furthermore, the author
speaks about international cooperation, shared responsibility and the prevention of factors of
climate change, hunger, inadequate health care, polarity in the economic development, and
achieving equality. The author dedicates special attention to the right to health, its aspects and
connections with international solidarity in protection of vulnerable groups.