| All matches played at Sport Hall (Slivnitsa), Sofia. | | | | 4 teams - 5th to 9th from Sofia Championship played for 1 place. |
| Rk | Ranking | won | lst | pf | pa | p+- | ratio | | 1. | Parkstroi Sofia | 2 | 0 | 135: | 123 | +12 | 1.098 | | 2. | CDNA Sofia | 1 | 1 | 136: | 139 | -3 | 0.978 | | 3. | Spartak II Sofia | 1 | 1 | 132: | 127 | +5 | 1.039 | | 4. | ISI Sofia | 0 | 2 | 130: | 144 | -14 | 0.903 |
| Team | Park | CDNA | Spar | ISI | | Parkstroi Sofia | ---- | - | 72:64 | 63:59 | | CDNA Sofia | | ---- | | 81:71 | | Spartak II Sofia | | 68:55 | ---- | - | | ISI Sofia | | | | ---- |
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| Parkstroy Sofia won a place in A RBG Men 1958. |
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| date | time | team 1 _________ | score | team 2 _________ | HT | | Tue 10.12.57 | 17:30 | Parkstroi Sofia | 63-59 | ISI Sofia | 28-26 | | Tue 10.12.57 | 19:00 | Spartak II Sofia | 68-55 | CDNA Sofia | 31-23 | | Wed 11.12.57 | 16:00 | CDNA Sofia | 81-71 | ISI Sofia | 32-36 | | Wed 11.12.57 | 17:30 | Parkstroi Sofia | 72-64 | Spartak II Sofia | 31-24 | | Fri 13.12.57 | 16:00 | Spartak II Sofia | | ISI Sofia | | | Fri 13.12.57 | 18:00 | Parkstroi Sofia | | CDNA Sofia | |
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| | | 3 teams otside Sofia played for 1 place. |
| Rk | Ranking | won | lst | pf | pa | p+- | ratio | | 1. | Levski Kyustendil | 2 | 0 | 141: | 118 | +23 | 1.195 | | 2. | Panayot Volov Kolarovgr. | 0 | 1 | 66: | 73 | -7 | 0.904 | | 3. | Botev Stara Zagora | 0 | 1 | 52: | 68 | -16 | 0.765 |
| Team | Levs | Pana | Bote | | Levski Kyustendil | ---- | 73:66 | 68:52 | | Panayot Volov Kolarovgr. | | ---- | - | | Botev Stara Zagora | | | ---- |
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| Levski Kyustendil won a place in A RBG Men 1958. |
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| date | time | team 1 _________ | score | team 2 _________ | HT | | Tue 10.12.57 | 1-:00 | Levski Kyustendil | 68-52 | Botev Stara Zagora | | | Wed 11.12.57 | 1-:00 | Levski Kyustendil | 73-66 | Panayot Volov Kolarov | | | Fri 13.12.57 | 1-:00 | Panayot Volov Kolarov | | Botev Stara Zagora | |
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