| 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 | 3 | 0 | 196: | 181 | +15 | 1.083 | | 2. | Spartak II Sofia | 2 | 1 | 197: | 183 | +14 | 1.077 | | 3. | CDNA Sofia | 1 | 2 | 194: | 200 | -6 | 0.970 | | 4. | ISI Sofia | 0 | 3 | 186: | 209 | -23 | 0.890 |
| Team | Park | Spar | CDNA | ISI | | Parkstroi Sofia | ---- | 72:64 | 61:58aot | 63:59 | | Spartak II Sofia | | ---- | 68:55 | 65:56 | | CDNA Sofia | | | ---- | 81:71 | | ISI Sofia | | | | ---- |
|
| Parkstroy Sofia won a place in A RBG Men 1958. |
|
| date | team 1 _________ | score | team 2 _________ | HT, FT | | Tue 10.12.5717:30 | Parkstroi Sofia | 63-59 | ISI Sofia | 28-26 | | Tue 10.12.5719:00 | Spartak II Sofia | 68-55 | CDNA Sofia | 31-23 | | Wed 11.12.5716:00 | CDNA Sofia | 81-71 | ISI Sofia | 32-36 | | Wed 11.12.5717:30 | Parkstroi Sofia | 72-64 | Spartak II Sofia | 31-24 | | Thu 12.12.5716:00 | Spartak II Sofia | 65-56 | ISI Sofia | 28-35 | | Thu 12.12.5718:00 | Parkstroi Sofia | 61-58 | CDNA Sofia | 31-23, 55-55 |
|
|
|
| | | 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. | Botev Stara Zagora | 1 | 1 | 122: | 131 | -9 | 0.931 | | 3. | Panayot Volov Kolarovgr. | 0 | 2 | 129: | 143 | -14 | 0.902 |
| Team | Levs | Bote | Pana | | Levski Kyustendil | ---- | 68:52 | 73:66 | | Botev Stara Zagora | | ---- | 70:63 | | Panayot Volov Kolarovgr. | | | ---- |
|
| Levski Kyustendil won a place in A RBG Men 1958. |
|
| date | team 1 _________ | score | team 2 _________ | HT | | Tue 10.12.5716:00 | Levski Kyustendil | 68-52 | Botev Stara Zagora | | | Wed 11.12.5719:00 | Levski Kyustendil | 73-66 | Panayot Volov Kolarov | | | Thu 12.12.5717:00 | Botev Stara Zagora | 70-63 | Panayot Volov Kolarov | 31-35 |
|
|
| 